Samsung NX100 Review

20-50mm Zoom
Very good performance with the 20-50mm kit lens.

The Samsung NX100 is available bundled with the Samsung 20-50mm f/3.5-5.6 ED NX lens, with a 35mm equivalent focal range of about 31-77mm. Its 2.5x zoom ratio is lower than average for a kit lens, and it doesn't go as wide as most kit lenses either. Optical performance was however quite good at 20mm, with strong detail across most of the frame and only minor softness in the corners (at f/8). Coma distortion in the trees was low, and chromatic aberration was very well controlled. Results were excellent at the 50mm setting, with very good sharpness across the frame and negligible chromatic aberration.

Macro
A larger than average area, with somewhat soft detail.

As with zoom performance, the Samsung NX100's macro performance will depend entirely on the lens in use. However with the 20-50mm kit lens set to 50mm, the Samsung NX100 captured a larger than average minimum area measuring 3.44 x 2.29 inches (87 x 58 millimeters). Resolution was pretty consistent across the frame, though detail was a little soft overall. The corners didn't show significant softening compared to the center. Most lenses show some softening in the corners at macro distances, so the 20-50mm kit lens performed better than most in this regard, though we found it too soft overall.

Geometric Distortion
Very low geometric distortion at both wide-angle and telephoto in JPEGs, high barrel distortion at wide-angle in uncorrected RAW.

In-Camera JPEG: Virtually no distortion at 20mm, less than a pixel

In-Camera JPEG: Pincushion distortion at 50mm is 0.1 percent, barely visible

Uncorrected RAW: High barrel distortion at 20mm, about 1.7%

Uncorrected RAW: Pincushion distortion at 50mm is 0.1 percent, barely visible

The Samsung NX100's 20-50mm kit lens produced less than a pixel of pincushion distortion at wide-angle, which is much better than average and not even noticeable in its images. At the telephoto end, there's about 0.1 percent pincushion distortion, which is low and only slightly perceptible. This is the tendency for the lens to bend straight lines outward (like a barrel -- usually at wide-angle) or inward (like a pincushion -- usually at telephoto).

Not surprisingly, uncorrected RAW files converted with dcraw show a lot of geometric distortion at wide-angle (about 1.7 percent).  There was hardly any geometric distortion at full telephoto. That's not unusual for a compact system camera lens, though the Samsung NX100's in-camera JPEGs do show more artifacts as a result of the correction than most other compact system cameras that correct for high amounts of barrel distortion. Artifacts such as jagged edges on horizontal and vertical edges are visible if you look closely (see magnified crop at right). The bundled Samsung RAW Converter 4 software as well as Adobe Camera Raw automatically correct for geometric distortion in the NX100's RAW files, and they both don't generate these artifacts seen in the in-camera JPEGs.

Chromatic Aberration and Corner Sharpness
JPEGs have low and not very bright chromatic aberration at wide-angle and full telephoto. The lens produced some slightly soft corners, mainly in the lower corners.

20-50mm kit lens
20mm @f/3.5: Lower left C.A.: Low and not very bright Softness: Minor blurring	20mm @f/3.5: Center C.A.: Very low Softness: Sharp
50mm @ f/5.6: Lower right C.A.: Very low Softness: Very slight blurring	50mm @ f/5.6: Center C.A.: Very low Softness: Sharp

Chromatic Aberration. Chromatic aberration in the corners with the NX100's 20-50mm kit lens at wide-angle (20mm) is fairly low in terms of the number of pixels, and not very bright, so the effect is not that noticeable. At full telephoto (50mm), C.A. is quite low. 

Corner Softness. The Samsung NX100's 20-50mm kit lens produced some slightly soft corners in a few shots, but corner sharpness was generally pretty good. At full wide-angle, the lower left corner was softest overall, though modest blurring was also present in the other corners. The center of the image was sharp with good contrast. At full telephoto, the corners were again only slightly soft, while the center was sharp. There doesn't appear to be much corner shading ("vignetting"), which is very good. A much better than average performance for a kit lens here, especially considering these shots were taken "wide-open" at maximum aperture, though keep in mind this lens does not go as wide or as long as most kit lenses.

C.A. Reduction in JPEGs. As you can see from the crops above comparing an in-camera JPEG (left) to a dcraw converted SRW file (right) taken with the 20-50mm lens, the Samsung NX100 does appear to be applying chromatic aberration reduction during its processing of JPEG files. In the second set of crops at 50mm, C.A. was pretty low to begin with, so there's not as much difference between the JPEGs and uncorrected RAW crops.

Accuracy
Very good accuracy from the AMOLED monitor.

The Samsung NX100's AMOLED monitor proved to be quite accurate, showing about 99% coverage with the 20-50mm kit lens at wide-angle, and about 100% at full telephoto. The slightly lower accuracy at wide-angle is likely the result of the geometric distortion correction applied for the kit lens. Still, very good results here.

Saturation & Hue Accuracy
Bright color, but with fairly good hue accuracy overall.

In the diagram above, the squares show the original color, and the circles show the color that the camera captured. More saturated colors are located toward the periphery of the graph. Hue changes as you travel around the center. Thus, hue-accurate, highly saturated colors appear as lines radiating from the center. Click for a larger image.

Saturation. The Samsung NX100 produces images with vibrant color using the standard, default settings. The camera pushes bright reds and blues, as well as some greens, dark brown and purples. Default saturation is 114.9% (14.9% oversaturated), which is higher than most recent competitors, but not dramatically so. You can of course tweak saturation to your liking, or choose a different color mode. See the comparison of alternate "Picture Wizard" options below. Most consumer digital cameras produce color that's more highly saturated (more intense) than found in the original subjects. This is simply because most people like their color a bit brighter than life.

Skin tones. Here, when adjusted for the correct white balance, the Samsung NX100 did well on lighter skin tones, which were only slightly on the pinkish side conveying a healthy looking glow. Darker skin tones, however, showed a very strong shift toward orange. Where oversaturation is most problematic is on Caucasian skin tones, as it's very easy for these "memory colors" to be seen as too bright, too pink, too yellow, etc.

Hue. The Samsung NX100 did shift cyan toward blue, dark red toward orange, orange toward yellow and yellow toward green, but shifts were relatively minor to moderate. With an average "delta-C" color error of 4.63 after correction for saturation, overall hue accuracy was pretty good. Hue is "what color" the color is.

Picture Wizard
The Samsung NX100 offers nine preset "Picture Wizard" options, plus three custom options. You can adjust contrast, saturation, sharpness and color tone for any of the settings.

Picture Wizard Options
Standard
Calm	Classic	Cool	Forest
Landscape	Portrait	Retro	Vivid

Mouse over the links above to see the effect of the presets on our Still Life target. You can click on a link to load the full resolution image.

Saturation Adjustment
Samsung NX100 lets you adjust image saturation (as well as contrast and sharpness) in nine steps. As can be seen below, the saturation adjustment was quite effective and covers a useful range, but it does impact contrast somewhat, at least for some colors. This is not uncommon though, as it's pretty tricky not to impact contrast when adjusting saturation so much.

Saturation Adjustment Examples
-4	-2	0	+2	+4

The table above shows results with every other saturation setting, including the default and the two extremes. Click on any thumbnail above, then click again to see the full-sized image.

Exposure and White Balance

Indoors, incandescent lighting
Noticeable pink casts with Auto, Incandescent and 2,600 Kelvin settings, though better performance with Manual. Average amount of positive exposure compensation required.

Indoors, under normal incandescent lighting, color balance was quite pink with the Auto, Incandescent and 2,600 Kelvin settings. Manual mode produced more accurate overall color, though it was a hint cool. The Samsung NX100 required an average amount of positive exposure compensation here, at +0.3 EV. Overall color looks fairly good, though you can see that oranges and reds are pushed. (Our test lighting for this shot is a mixture of 60 and 100 watt household incandescent bulbs, a pretty yellow light source, but a very common one in typical home settings here in the U.S.)

Outdoors, daylight
Vibrant colors overall, though with a tendency toward a cool cast and slightly high contrast under harsh lighting. Better than average exposure accuracy in our Portrait shot, but our Far-field House shot was slightly overexposed.

Outdoors, the Samsung NX100 tended toward a slightly cool color balance when set to Auto white balance. The Manual setting does warm things up a little, and personal preference will come into play here. The NX100 required + 0.3 EV exposure compensation to keep facial tones reasonably bright on the model. The average for this shot is +0.7 EV, so that's pretty good. Still, there were quite a few blown highlights in her shirt and flowers. The NX100 overexposed our Far-field House shot at default exposure, leading to quite a few blown highlights in the white trim. Color balance was also a bit on the cool side. Default contrast is high, but fortunately, there's Smart Range and a contrast adjustment to help compensate. Overall, fair results here. See the Extremes section below.

See full set of test images with explanations
See thumbnails of all test and gallery images

Resolution
Very high resolution, 1,900 to 2,100 lines of strong detail in JPEGs, a bit more from ACR converted RAW files.

In-camera JPEGs of our laboratory resolution chart at the highest quality settings revealed sharp, distinct line patterns down to about 1,900 lines per picture height in the horizontal direction, and about 2,100 lines per picture height in the vertical direction. Complete extinction of the pattern didn't occur until a little over 3,000 lines in both directions. An Adobe Camera RAW 6.3 conversion of our resolution chart showed slightly improved horizontal resolution but didn't really show significantly higher resolution in the vertical direction, though there were fewer artifacts near the limits. Use these numbers to compare with other cameras of similar resolution, or use them to see just what higher resolution can mean in terms of potential detail.

See full set of test images with explanations
See thumbnails of all test and gallery images

Sharpness & Detail
Pretty good sharpness overall, though fine detail is a little soft and there are minor edge-enhancement artifacts on some high-contrast subjects. Moderate noise suppression visible in the shadows.

Sharpness. The Samsung NX100 captures fairly sharp images overall, though some edge enhancement artifacts are visible on high-contrast subjects such as the thicker branches, roof and trim in the crop above left. (Most noticeable on edges of white trim against the brick; note the light halo there.) Fine detail such as the smaller branches and twigs show very little edge enhancement, but are also appear a little soft. The NX100 offers nine levels of sharpening though, so you can always tweak JPEG output to your taste. Edge enhancement creates the illusion of sharpness by enhancing colors and tones right at the edge of a rapid transition in color or tone.

Detail. The crop above right shows some moderate noise suppression artifacts in the darkest areas of the model's hair, smudging individual strands together in the shadows and where local contrast is low. Overall, results are a bit below average for a modern APS-C sensor, and there is no way to reduce noise reduction at low ISOs with the NX100, unless you shoot RAW. Noise-suppression systems in digital cameras tend to flatten-out detail in areas of subtle contrast. The effects can often be seen in shots of human hair, where the individual strands are lost and an almost "watercolor" look appears.

RAW vs In-Camera JPEGs
As noted above, the Samsung NX100 produces fairly sharp in-camera JPEGs, though fine detail can be a little soft. Often, more detail can be obtained from carefully processing RAW files than can be seen in the in-camera JPEGs. Take a look below, to see what we mean:

SuperFine Camera JPEG (Defaults)	Samsung Raw Converter 4 (Defaults)	Samsung Raw Converter 4 (Sharpened)	Adobe Camera Raw 6.3 (Sharpened)

In the table above, mousing over a link at the bottom will load the corresponding crop in the area above, and clicking on the link will load the full resolution image.

It's a little difficult to tell because the camera JPEG is slightly overexposed, but you can see that the Samsung RAW Converter 4 conversion at default settings resulted in an image that is softer than the in-camera JPEG. (Normally, manufacturer provided converters produce results very similar to in-camera JPEGs at default settings, but Samsung RAW Converter 4 is a rebadged version of SilkyPix, so it probably doesn't implement the exact same image processing algorithms as the camera.) The bundled RAW converter has quite a few features and presets, but we found very good results by turning off sharping in the editor itself, and then applying strong unsharp masking of 500% with a radius of 0.3 when generating the output JPEG. (There's no interactive preview at 100% doing it that way, though, so it does take some experimentation.) A bit more detail can be seen with the sharpened version, but not much, probably due to noise reduction. The Adobe Camera Raw conversion (which was sharpened in Photoshop using unsharp masking of 400% with radius 0.3) revealed more fine detail than the camera JPEG and SilkyPix conversions, but it also shows a bit more noise at default settings, which is often the case. One of the advantages of shooting RAW is being able to decide for yourself the optimism trade-off between detail and noise, especially when the camera provides no or very limited control over noise reduction like the Samsung NX100.

ISO & Noise Performance
Low to moderate noise with good detail up to ISO 800, high noise at higher ISOs.

Default High ISO Noise Reduction (On)
ISO 100	ISO 200	ISO 400
ISO 800	ISO 1,600	ISO 3,200
	ISO 6,400

The Samsung NX100's images are quite clean at ISO 100, and ISO 200 is almost as clean, but there is subtle detail loss in low contrast areas even at base ISO. A more noticeable noise grain pattern emerges at ISO 400, though fine detail is very good, with just a hint of chroma noise creeping into the shadows. The grain pattern and chroma noise become stronger at ISO 800 and 1,600, though detail still remains relatively strong. At ISO 3,200, there is a noticeable increase in noise reduction which reduces chroma noise but flattens out a lot of fine detail in the hair, giving the image a stippled appearance. By ISO 6,400, noise and noise suppression efforts are very strong and the image is quite blurry with lots of chroma noise. Exposure levels dropped a bit as well at the higher ISOs. As always, see the Print Quality section below for maximum recommended print sizes at each ISO.

A note about focus for this shot: We shoot this image at f/4, using one of three very sharp reference lenses (70mm Sigma f/2.8 macro for most cameras, 60mm f/2.8 Nikkor macro for Nikon bodies without a drive motor, Olympus Zuiko 50mm f/2.0 for Four Thirds and Micro Four Thirds bodies). Unfortunately, Samsung doesn't have an NX prime lens with sufficient focal length for this shot, so we had to use the kit 20-50mm lens here. Luckily, it's pretty sharp at telephoto. To insure that the hair detail we use for making critical judgements about camera noise processing and detail rendering is in sharp focus at the relatively wide aperture we're shooting at, the focus target at the center of the scene is on a movable stand. This lets us compensate for front- or back-focus by different camera bodies, even those that lack micro-focus adjustments. This does mean, though, that the focus target itself may appear soft or slightly out of focus for bodies that front- or back-focused with the reference lens. If you click to view the full-size image for one of these shots and notice that the focus target is fuzzy, you don't need to email and tell us about it; we already know it. :-) The focus target position will simply have been adjusted to insure that the rest of the scene is focused properly.

As mentioned previously, the Samsung NX100's default noise reduction can be a little heavy-handed depending on the subject, even at base ISO. To make matters worse there are no noise reduction adjustments offered, except at ISO 3,200 and above, where On and Off are the only choices. Have a look at the crops below to see how much detail is lost to noise reduction at ISO 100:

The above crops compare in-camera JPEGs (left) to ACR converted RAW files (right). Both sets of shots were taken at ISO 100, and the converted RAW files have default noise reduction applied. A lot of digital cameras struggle with reproducing hair and fine detail in the red fabric's leaf pattern at higher ISOs, but usually not quite to this extent for a camera with an APS-C sensor at base ISO.

Extremes: Sunlit and low light tests
Very high resolution with good overall detail, but somewhat high default contrast and limited dynamic range. Improved low-light performance with new firmware.

Sunlight. The Samsung NX100 struggled a bit with the deliberately harsh lighting of this test, as do a lot of cameras. Strong highlights were clipped in the white shirt and flowers, which unfortunately is common. Shadow detail is pretty good, albeit a bit noisy. We preferred the +0.3 EV exposure overall, because the exposure of the skin tone in the face was better than 0 EV, without blowing out nearly as many highlights as with +0.7 EV. Depending on the photographer, you could lean one way or the other. Advanced users will want to shoot darker, to hold highlight detail. For those NX100 owners that are going to want to just print an image, the +0.3 image would probably produce the best-looking print with little or no tweaking. The bottom line though, is that the NX100 struggled in harsh lighting, producing ether a slightly dim face with good highlight retention in the shirt, or an well-exposed face with a lot of blown highlights in her shirt, suggesting low dynamic range.

Looking at the images more closely and running our dynamic range tests reveal extremely low dynamic range, but the tone curve masks that fact somewhat, with increased gradation in the shadows. Our eyes can see a wider range on the test chart, but it's an area that includes more image noise, which the program looks for and excludes.

Because digital cameras are more like slide film than negative film (in that they tend to have a more limited tonal range), we test them in the harshest situations to see how they handle scenes with bright highlights and dark shadows, as well as what kind of sensitivity they have in low light. The shot above is designed to mimic the very harsh, contrasty effect of direct noonday sunlight, a very tough challenge for most digital cameras. (You can read details of this test here. In actual shooting conditions, be sure to use fill flash in situations like the one shown here; it's better to shoot in open shade whenever possible.)

Contrast Adjustment
The Samsung NX100's contrast adjustment wasn't much help in taming blown highlights in this harsh lighting.

Minimum Contrast
Contrast set to lowest, Auto Exposure	Contrast set to lowest, Auto Exposure

At its lowest contrast setting, the Samsung NX100 didn't do much better at preserving highlight detail. (It may look like it helped in the "Sunlit" Portrait shot above, but the better highlight retention is because of the lower exposure used in our Contrast series than the image we picked for best exposure of the face. You can see what we mean by looking at the Far-field House shot on the right, which still has about the same amount of highlights clipped as the default contrast using same exposure.) However, at the lowest contrast setting midtones and shadows were boosted quite a bit. The odd-looking coloration in the mannequin's face is due to drop in saturation where contrast was reduced, which is an unfortunate interaction.

Contrast Adjustment Examples
-4	-2	0	+2	+4

The table above shows results with every other contrast setting, including the default and two extremes. It's pretty hard to evaluate small differences in contrast on small thumbnails like these, click on any thumbnail to go to the full-size image. It's nice that Samsung offers such a wide range of settings, but as mentioned previously, the NX100's contrast adjustment helps very little with strong highlights here, working mostly in the midtones and shadows. Also mentioned previously, there is some interaction with saturation, most noticeable in the facial tones and flowers at the lower contrast settings.

Outdoor Portrait Smart Range Example
Off, ISO 100, 0 EV	On, ISO 200, 0 EV
Highlights
Shadows (Levels adjusted equally in Photoshop to show noise)

Smart Range is Samsung's name for their dynamic range enhancement technology. It works similar to Canon's Highlight Tone Priority, preserving highlights at the expense of noisier shadows. In the bright highlights, we do see much better detail handling. Despite the apparent brightness, very few highlights were clipped with Smart Range on in our Outdoor Portrait shot above. Smart Range doesn't seem to affect levels in the shadows much, darkening them just a touch in this example, but because it uses ISO 200 there is more noise visible. The NX100 attempts to compensate by applying stronger noise reduction, which leads to additional loss of detail and some blotchiness in the shadows.

Far Field Smart Range Example
Off, ISO 100, 0 EV	On, ISO 200, 0 EV
Highlights
Shadows

This is a another example of Smart Range at work. Here again we can clearly see better highlight retention in the white trim with it enabled, though shadows are darker with less detail because of the higher ISO and increased noise reduction.

Face Detection
Off at 0 EV	On at 0 EV	Portrait Mode, 0 EV

Face Detection
Like most Point & Shoot cameras these days (and many DSLRs in Live View mode), the Samsung NX100 has the ability to detect faces, and adjust exposure and focus accordingly. The NX100 does it automatically in Portrait and Beauty Shot scene modes, or when Face Detection AF mode is selected. As you can see from the examples above, face detection worked fairly well, as the image with face detection enabled (center) was better exposed for the face without having to use exposure compensation, and white balance was a little warmer. Switching to Portrait Mode (from Aperture Priority) resulted in a slightly different exposure, though still brighter than the default exposure. Here, the camera boosted shutter speed to 1/80s (from 1/30s) presumably to help prevent subject motion blur, opened the aperture (from f/8 to f/5.6) for less depth-of-field to help make the subject stand out from the background, and raised ISO to 160 (from 100). The face is also noticeably softer, probably to reduce the appearance of blemishes.

Because digital cameras are more like slide film than negative film (in that they tend to have a more limited tonal range), we test them in the harshest situations to see how they handle scenes with bright highlights and dark shadows, as well as what kind of sensitivity they have in low light. The shot above is designed to mimic the very harsh, contrasty effect of direct noonday sunlight, a very tough challenge for most digital cameras. (You can read details of this test here.)

	1 fc 11 lux	1/2 fc 5.5 lux	1/4 fc 2.7 lux	1/8 fc 1.3 lux	1/16 fc 0.67 lux	1/16fc No NR
ISO 100	4 s f3.5	8 s f3.5	15 s f3.5	30 s f3.5	30 s f3.5	30 s f3.5
ISO 200	2 s f3.5	4 s f3.5	8 s f3.5	15 s f3.5	30 s f3.5	30 s f3.5
ISO 400	1 s f3.5	2 s f3.5	4 s f3.5	8 s f3.5	15 s f3.5	15 s f3.5
ISO 800	0.5 s f3.5	1 s f3.5	2 s f3.5	4 s f3.5	8 s f3.5	8 s f3.5
ISO 1600	1/4 s f3.5	0.5 s f3.5	1 s f3.5	2 s f3.5	4 s f3.5	4 s f3.5
ISO 3200	1/8 s f3.5	1/4 s f3.5	0.5 s f3.5	1 s f3.5	2 s f3.5	2 s f3.5
ISO 6400	1/15 s f3.5	1/8 s f3.5	1/4 s f3.5	0.5 s f3.5	1 s f3.5	1 s f3.5

Low Light. The Samsung NX100 performed reasonably well in our low light test, though exposure metering was not reliable at the lowest light level, so we used manual exposure mode for these shots. The NX100's slowest shutter speed of 30 seconds combined with the kit lens' maximum aperture of f/3.5 resulted in slightly dim (but still usable) images at the lowest light level we test at (1/16 foot-candle) at ISO 100.

Firmware fix. Top is with original v1.01 firmware. Bottom with new v1.10 firmware. Both are ISO 800 at 1/16 fc, 8s, f/3.5.

With the original v1.01 firmware the camera shipped with, the Samsung NX100 was able to produce bright images down to the lowest light level at ISOs 200 and 400, but produced some very dark, odd-looking JPEG images at ISO 800 and above at the lowest light level. The matching RAW files looked okay for these odd-looking shots, so it appeared to be an issue with the image processing and not the sensor itself. We let Samsung know of this strange phenomenon. They were able to duplicate the issue, and provided us with v1.10 firmware that corrected the issue. See thumbnails at right. Kudos to Samsung for being so responsive. We've reshot all our low-light images above with this new firmware.

Noise is pretty well controlled up to ISO 400, though at higher ISOs there are moderate amounts of fine luminance noise and some blotchy chroma noise in the shadows. Auto white balance did a good job here, producing fairly neutral color balance, though there's a loss of overall color saturation at higher ISOs. Some horizontal banding is also visible at lower light levels and higher ISOs. We didn't notice any hot/dead pixels.

The camera's autofocus system was able to focus on the subject down to between the 1/4 and 1/8 foot-candle light level unassisted with the 20-50mm kit lens, which isn't as good as most SLRs using phase-detection AF, but reasonable for a compact system camera with a relatively slow (dim) kit lens. The NX100 was able to focus in complete darkness with its built-in focus assist lamp enabled.

How bright is this? The one foot-candle light level that this test begins at roughly corresponds to the brightness of typical city street-lighting at night. Cameras performing well at that level should be able to snap good-looking photos of street-lit scenes.

NOTE: This low light test is conducted with a stationary subject, and the camera mounted on a sturdy tripod. Most digital cameras will fail miserably when faced with a moving subject in dim lighting. (For example, a child's ballet recital or a holiday pageant in a gymnasium.) Thanks to their phase-detect AF systems, digital SLRs tend to do much better than point & shoots, but you still shouldn't expect a quick autofocus lock with moving subjects. The NX100 uses contrast-detect autofocus, as is found in most point & shoot cameras, so its low-light focusing ability is less than that of most SLRs with phase-detect systems. That said, though, the larger, more sensitive pixels of the NX100's sensor do better under dim lighting than do the tiny pixels of most point & shoots, (A useful trick is to just prop the camera on a convenient surface, and use its self-timer to release the shutter. This avoids any jiggling from your finger pressing the shutter button, and can work quite well when you don't have a tripod handy.)

Print Quality

Good 20x30-inch prints from ISO 100-400; ISO 1,600 images are good at 11x14; ISO 6,400 shots are usable at 5x7.

ISO 100 shots are a little soft at 20x30. Some high-contrast detail is pretty good, but low-contrast detail is softened noticeably at this size, just as we saw onscreen. Printing at 16x24 looks a little better, averaging out high and low-contrast detail reasonably well.

ISO 200 images likewise look soft at 20x30, but much better at 16x24.

ISO 400 shots look about the same, better at 16x24, but usable at 20x30 inches.

ISO 800 shots are still quite good at 16x24 inches, except for the low-contrast detail, which looks better printed at 13x19 inches.

ISO 1,600 images are a little rough at 13x19 inches, but still usable. Things tighten up quite a bit at 11x14, save for a little noise in the shadows.

ISO 3,200 files lose image quality rather abruptly, becoming usable at 8x10 for wall display, and better at 5x7. The image exposure is also darker overall.

ISO 6,400 shots are not usable at 8x10, but acceptable at 5x7, if a little dark.

All told, shots from the Samsung NX100 follow a good pattern, producing quality printable images from ISO 100 to 800 at very large sizes, with quality falling off rapidly after 1,600. Still, even its highest ISO files can make a good 5x7-inch print with only a little adjustment when necessary. Printed results, in short, go a long way toward redeeming the JPEG performance of the Samsung NX100 compared to what we saw in our crops.

Testing hundreds of digital cameras, we've found that you can only tell just so much about a camera's image quality by viewing its images on-screen. Ultimately, there's no substitute for printing a lot of images and examining them closely. For this reason, we now routinely print sample images from the cameras we test on our Canon Pro9000 Mark II studio printer, and the Canon Pixma MP610 here in the office. (See the Canon Pixma Pro9000 Mark II review for details on that model.)

The Samsung NX100 was generally slower than average compared to most consumer SLRs, but performance was good for a compact system camera.

Startup and shut-down times were slower than those for most SLRs, but good for a compact system camera. Sensor cleaning can be enabled on start-up. The default is off, which is what we tested with. Buffer clearing will depend on image size and quality, as well as card speed. Here, the Samsung NX100 was a bit sluggish, considering the shallow buffers.

Mode switching was pretty good for its class, except Record to Play which was sluggish.

The Samsung NX100 showed full-autofocus shutter lag (with the subject at a fixed distance) that ranged from 0.431 second in single-area AF mode at wide-angle to 0.444 second in multi-area AF mode at wide-angle when using the 20-50mm kit lens. The size of the focus area made little difference.

Shutter lag was 0.422 second in continuous mode AF, though your subject may not be in focus in this mode. When manually focused, the Samsung NX100's lag time dropped to 0.122 second, which is reasonably fast. The NX100's prefocused shutter lag time was similar, at 0.107 second, a little slower than most cameras.

To minimize the effect of different lens' focusing speed, we test AF-active shutter lag with the lens already set to the correct focal distance. We also use the same Sigma 70mm f/2.8 macro with every camera (on all platforms except Four Thirds/Micro Four Thirds, Samsung NX, and Nikon consumer models lacking an in-body focus motor), to further reduce variation, and because our tests showed that focus-determination time with this lens was close to the fastest, across multiple camera bodies from different manufacturers. Being an older design with a non-ultrasonic motor, it wouldn't be the fastest at slewing from one focus setting to another, but that's exactly the reason we measure focus determination speed, which is primarily a function of the camera body, vs focus adjustment speed, which is primarily a function of the lens.

Single-shot cycle times are a bit on the slow side, ranging from 1.06 second for large/superfine JPEGs to 1.08 seconds for RAW + LSF JPEG files.

Continuous mode at full resolution was slightly slower to average for its class, at around 2.9 frames-per-second for large/superfine JPEGs or RAW files. Oddly, continuous mode rate increased slightly to 3.13 frames-per-second for RAW + LSF JPEGs. Buffer depths were pretty limited though, at only 8 large/superfine JPEGs, and only 4 RAW or RAW + LSF JPEGs before the NX100 slowed down. Note that our test target for this is designed to be difficult to compress, so JPEG burst lengths may be longer with typical subjects.

Download speeds were pretty fast, quick enough that you probably won't feel the need for a separate card reader, even with large memory cards. (Note that this test was performed with a SanDisk Extreme III 30 MB/sec SD card: Slower cards would likely show slower transfer times.)

Bottom line, the Samsung NX100 performance is pretty good for a compact system camera overall. Full autofocus is a bit slow compared to most SLRs, but good for CSC and on par or better than most digicams. Cycle times are a bit sluggish, but also better than most digicams. Burst speed is about average, but buffer depths are pretty shallow, especially with those large RAW files.

Battery
Fair battery life for a compact system camera.

The Samsung NX100 uses a custom rechargeable lithium-ion battery pack for power, and comes with both a single battery and charger. Samsung rates battery life at 420 shots per charge. This may seem good for a compact system camera at first glance, but keep in mind the NX100 has no built-in flash, and the CIPA standard specifies 50% flash shots for their rating. We recommend getting a second battery for your NX100 if you plan any extended outings.

The table above shows the number of shots the camera is capable of (on a fully-charged rechargeable battery), based on CIPA battery-life and/or manufacturer standard test conditions.

(Interested readers can find an English translation of the CIPA DC-002 standards document here. (180K PDF document))

Storage
The Samsung NX100 accepts SD/SDHC memory cards, and does not ship with a card. The user manual doesn't specify minimum card speed for movies, but we recommend cards with at least a Class 4 speed rating for 720p H.264 video, and it doesn't hurt to get a faster one.

We strongly recommend buying a large capacity SDHC memory card at least a 4GB card, preferably a 8 or 16GB one, to give yourself extra space for extended outings, or when shooting RAW or video files. (Check the shopping link above, memory cards are really cheap these days, so no reason to skimp.)