Sony DSC-W170 Review

 
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Sony W170 Exposure


Color

Saturation & Hue Accuracy
Vibrant colors with slight oversaturation in red and blue tones.

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 towards 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.

Saturation. The Sony W170 oversaturates bright red and blue tones somewhat, but undersaturates some yellow and green tones just a bit. 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. The W170 produced slightly pinkish skin tones, but overall results were still fairly natural. 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 Sony W170 showed fairly small color shifts relative to the correct mathematical translation of colors in its subjects, pushing cyan toward blue, red toward orange and some oranges toward yellow. Overall color accuracy was quite good though. Hue is "what color" the color is.


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

Sensor

Exposure and White Balance

Indoors, incandescent lighting
Warm casts with both Auto and Incandescent white balance settings. Slightly less than average positive exposure compensation required.

Auto White Balance
+0.7 EV
Incandescent White Balance
+0.7 EV

Color balance indoors under incandescent lighting was quite warm and a bit reddish in Auto white balance mode, while the Incandescent setting resulted in a more yellow color balance that we judged as the more pleasing of the two. (But still more highly colored than we'd prefer.) Unfortunately, like most Sony compacts of late, the W170 does not have a custom or manual white balance mode, which would result in a more neutral color balance indoors. The W170 required a +0.7 EV exposure compensation boost to get a good exposure, a little less than average for this shot. Overall color is a bit dark and yellow here, making the blue flowers very dark, and a bit purplish. 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
High contrast, but still very good overall exposure under bright conditions. Good color as well.

Auto White Balance,
Auto Exposure
Auto White Balance,
Auto Exposure

Outdoors, the Sony W170 performed fairly well, despite slightly high contrast. The camera holds onto a fair amount of detail in the bright highlights, though shadow detail falls apart a little due to high noise, as well as some blurring from noise suppression. Exposure was very good, as no exposure compensation was required for either shot. Though color is slightly warm, results are quite good here, even with the higher contrast.

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

Resolution
Very high resolution, 1,600 ~ 1,700 lines of strong detail.

Strong detail to
1,700 lines horizontal
Strong detail to
1,600 lines vertical

Our laboratory resolution chart revealed sharp, distinct line patterns down to about 1,700 lines per picture height in the horizontal direction, and about 1,600 lines in the vertical direction. Extinction of the pattern didn't occur below 2,000 lines, the limit of this chart. 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
Slightly soft images overall, with some visible edge-enhancement on high-contrast subjects. Noise suppression limits fine detail.

Good definition of high-contrast
elements, though slightly soft with
mild edge enhancement and
evidence of noise suppression.
Subtle detail: Hair
Noise suppression blurs
detail in areas of subtle contrast,
as in the darker parts of
Marti's hair here.

Sharpness. The Sony Cyber-shot DSC-W170 captures reasonably sharp images, though with slightly mottled detail. Some edge enhancement artifacts are visible on high-contrast subjects such as the crop above left, but it's minimal and not uncommon. 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 significant softening due to noise suppression, as the darker areas of Marti's hair show limited detail. Bright individual strands are evident, but definition is fuzzy. 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.

ISO & Noise Performance
Moderate noise at the normal sensitivity settings; stronger noise and blurring at higher ISO settings.

ISO 80 ISO 100 ISO 200
ISO 400 ISO 800 ISO 1,600
   
ISO 3,200

The Sony W170 produced moderately low noise at its 80 and 100 ISO settings, though some noise reduction artifacts are already visible at these low sensitivity levels. There's a noticeable jump in noise at ISO 200, where individual hairs are smudged together by aggressive noise reduction that's stomping out most of the fine detail. ISO 400 continues this trend, with even less fine detail and more visible NR artifacts, as well as visible chroma noise. At ISO 800, results are quite mottled, giving the image a stippled effect. Overall color balance starts to shift with purple and yellow color blotches as well. At ISOs 1,600 and especially 3,200, heavy noise reduction obliterates all fine detail, resulting in images that look more like watercolor paintings than photographs. As always, see the Output Quality section below to see how these results translate to prints.

Extremes: Sunlit and low light tests
High resolution with strong detail, but slightly high contrast and limited shadow detail. Limited low-light performance at the normal sensitivity settings, capable of capturing bright but noisy images in near darkness at the highest ISO settings.

-0.3 EV Default +0.3 EV

Sunlight. The Sony W170 produced fairly high contrast under the deliberately harsh lighting in the test above, with deep shadows and bright highlights. Still, overall exposure is pretty good, with reasonable midtone detail. Shadow detail is limited, both from noise suppression efforts and noise pixels. Though there is more highlight detail preserved at -0.3 EV, Marti's face was a bit too dim to our liking, so we preferred the default exposure even though some of the highlights in the shirt and flowers were clipped. In real life, be sure to use fill flash in situations like the one shown above; it's better to shoot in the shade when possible.


DRO Off DRO Standard DRO Plus

Sony's Dynamic Range Optimization (DRO)
The W170 doesn't have contrast adjustment, but it does offer two settings for Sony's Dynamic Range Optimization. See the images above (all at default auto exposure) to see how it reduces lost highlights and shadows in high contrast situations. DRO Standard adjusts the curve to preserve shadow and highlight detail, and DRO plus further analyzes the image to apply more processing where it's needed.

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
ISO
80
Click to see W170LL00803.JPG
1 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
ISO
100
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1 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
ISO
200
Click to see W170LL02003.JPG
0.8 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
ISO
400
Click to see W170LL04003.JPG
0.4 sec
f3.3
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0.8 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
ISO
800
Click to see W170LL08003.JPG
1/5 sec
f3.3
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0.4 sec
f3.3
Click to see W170LL08005.JPG
1 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
ISO
1600
Click to see W170LL16003.JPG
1/8 sec
f3.3
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1/5 sec
f3.3
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0.5 sec
f3.3
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1 sec
f3.3
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1 sec
f3.3
ISO
3200
Click to see W170LL32003.JPG
1/15 sec
f3.3
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1/10 sec
f3.3
Click to see W170LL32005.JPG
1/4 sec
f3.3
Click to see W170LL32006.JPG
0.5 sec
f3.3
Click to see W170LL32007.JPG
1 sec
f3.3
ISO
100
Night
Scene
Click to see W170LLTW03.JPG
2 sec
f3.3
Click to see W170LLTW04.JPG
2 sec
f3.3
Click to see W170LLTW05.JPG
2 sec
f3.3
Click to see W170LLTW06.JPG
2 sec
f3.3
Click to see W170LLTW07.JPG
2 sec
f3.3

Low light. The Sony W170 struggled with our low light test, limited by the 1 second maximum exposure duration (2 seconds in Night Scene mode). It was only able to capture bright images at the lowest light level when using its maximum ISO of 3,200, where noise levels are unacceptable. At the normal sensitivity settings, images were just a little dim even at the one foot-candle light level, which is equivalent to average city street-lighting at night. Color balance was pretty good with the Auto white balance setting at brighter levels, but images acquired a green cast as ISO increased and light levels dropped. The camera's autofocus system was able to focus on the subject down to the 1/4 foot-candle light level unassisted, and down to the darkest light level with the AF assist enabled. (A useful trick under these conditions 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.)

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.) For such applications, you may have better luck with a digital SLR camera, but even there, you'll likely need to set the focus manually. For information and reviews on digital SLRs, refer to our SLR review index page.

Flash

Coverage and Range
Uneven coverage at wide angle. Poor flash range at normal ISO settings.

28mm equivalent 140mm equivalent
Normal Flash,
High Intensity
Slow-Sync Flash,
High Intensity

Coverage. Flash coverage was uneven at wide angle (no surprise though, given the 28mm wide-angle lens). Coverage was more even at telephoto, but too dark. Indoors, under incandescent background lighting, the Sony DSC-W170's flash underexposed our subject at its default setting. Using the flash's High Intensity setting helped, but results were still a bit dim. The camera's Slow-Sync flash mode fared a bit better, though with a more yellow cast.


Flash Range: Wide Angle
6 ft 7 ft 8 ft 9 ft 10 ft 11 ft
Click to see W170FL06W.JPG
1/30 sec
f3.3
ISO 100
Click to see W170FL07W.JPG
1/30 sec
f3.3
ISO 100
Click to see W170FL08W.JPG
1/30 sec
f3.3
ISO 100
Click to see W170FL09W.JPG
1/30 sec
f3.3
ISO 100
Click to see W170FL10W.JPG
1/30 sec
f3.3
ISO 100
Click to see W170FL11W.JPG
1/30 sec
f3.3
ISO 100
12 ft 13 ft 14 ft 15 ft 16 ft
Click to see W170FL12W.JPG
1/30 sec
f3.3
ISO 100
Click to see W170FL13W.JPG
1/30 sec
f3.3
ISO 100
Click to see W170FL14W.JPG
1/30 sec
f3.3
ISO 100
Click to see W170FL15W.JPG
1/30 sec
f3.3
ISO 100
Click to see W170FL16W.JPG
1/30 sec
f3.3
ISO 100

Flash Range: Telephoto
6 ft 7 ft 8 ft 9 ft 10 ft 11 ft
Click to see W170FL06T.JPG
1/50 sec
f5.2
ISO 100
Click to see W170FL07T.JPG
1/50 sec
f5.2
ISO 100
Click to see W170FL08T.JPG
1/50 sec
f5.2
ISO 100
Click to see W170FL09T.JPG
1/50 sec
f5.2
ISO 100
Click to see W170FL10T.JPG
1/50 sec
f5.2
ISO 100
Click to see W170FL11T.JPG
1/50 sec
f5.2
ISO 100
12 ft 13 ft 14 ft 15 ft 16 ft
Click to see W170FL12T.JPG
1/50 sec
f5.2
ISO 100
Click to see W170FL13T.JPG
1/50 sec
f5.2
ISO 100
Click to see W170FL14T.JPG
1/50 sec
f5.2
ISO 100
Click to see W170FL15T.JPG
1/50 sec
f5.2
ISO 100
Click to see W170FL16T.JPG
1/50 sec
f5.2
ISO 100

ISO 100 Range. At wide angle, flash shots at ISO 100 remained fairly bright out to a distance of about 8 feet, decreasing in brightness from that point on. At full telephoto and ISO 100, the target at 6 feet was quite dim, getting darker from there.


Manufacturer-Specified Flash Range
Wide Angle Telephoto
Click to see W170FL_MFR138WA0800.JPG
13.8 feet
Auto ISO 800
Click to see W170FL_MFR089TA0500.JPG
8.9 feet
Auto ISO 500

Manufacturer Specified Flash Test. In the shots above, the W170 performs about as Sony says it will, producing good exposures at the rated distances with its ISO set to Auto. Unfortunately, the camera had to raise ISO sensitivity by quite a bit to achieve the bright images, resulting in excessive noise. Our standard test method for flash range uses a fixed setting of ISO 100, to provide a fair basis of comparison between cameras. We've now also begun shooting two shots using the manufacturer-specified camera settings, at the range the company claims for the camera, to assess the validity of the specific claims.

Output Quality

Print Quality
Good print quality, good color, sharp 13x19-inch prints at ISO 80 and 100. ISO 400 images are soft but usable at 11x14, ISO 800 shots are better at 5x7.

The Sony W170 had enough resolution to make good 13x19-inch prints at ISO 80, though with chroma noise in the shadows. 11x14-inch prints were a little better. Detail in colors starts to soften at ISO 200 when printed at 11x14, thanks to noise suppression. High contrast areas remain sharp, but not areas of subtle change, which is the theme throughout the rest of the ISO settings. There are too many color blotches at ISO 400 for 11x14 to stand, but 8x10 is better. ISO 800 shots look good at 8x10, with some minor noise that mimics film rather well; it looks better at 5x7. ISO 1,600 at 5x7 looks good in high contrast areas, but low contrast areas are just big empty fields of color. You notice this a little less at 4x6, but the lack of detail in colors is disappointing. ISO 3,200 is usable at 4x6, but I can't say that most people will like it. It's usable, but soft.

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 i9900 studio printer, and on the Canon iP5200 here in the office. (See the Canon i9900 review for details on that model.)

 

The images above were taken from our standardized test shots. For a collection of more pictorial photos, see our Sony Cyber-shot DSC-W170 Photo Gallery.

Recommended Software: Rescue your Photos!

Just as important as an extra memory card is a tool to rescue your images when one of your cards fails at some point in the future. We get a lot of email from readers who've lost photos due to a corrupted memory card. Memory card corruption can happen with any card type and any camera manufacturer, nobody's immune. A lot of "lost" images can be recovered with an inexpensive, easy to use piece of software though. Given the amount of email I've gotten on the topic, I now include this paragraph in all my digital camera reviews. The program you need is called PhotoRescue, by DataRescue SA. Read our review of it if you'd like, but download the program now, so you'll have it. It doesn't cost a penny until you need it, and even then it's only $29, with a money back guarantee. So download PhotoRescue for Windows or PhotoRescue for Mac while you're thinking of it. (While you're at it, download the PDF manual and quickstart guide as well.) Stash the file in a safe place and it'll be there when you need it. Trust me, needing this is not a matter of if, but when... PhotoRescue is about the best and easiest tool for recovering digital photos I've seen. (Disclosure: IR gets a small commission from sales of the product, but I'd highly recommend the program even if we didn't.) OK, now back to our regularly scheduled review...

Not sure which camera to buy? Let your eyes be the ultimate judge! Visit our Comparometer(tm) to compare images from the Sony Cyber-shot DSC-W170 with those from other cameras you may be considering. The proof is in the pictures, so let your own eyes decide which you like best!

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Note: For details, test results, and analysis of the many tests done with this camera, please click on the tabs at the beginning of the review or below.

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