Olympus C-50 ZoomOlympus packs a 5.0-megapixel CCD into an ultra-compact body, with a host of advanced features too.
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C50 Sample ImagesReview First Posted: 11/26/2002
Digital Cameras - Olympus C-50 Zoom Test Images
|I've begun including links in our reviews to a Thumber-generated index page for the test shots. The Thumber data includes a host of information on the images, including shutter speed, ISO setting, compression setting, etc. Rather than clutter the page below with *all* that detail, we're posting the Thumber index so only those interested in the information need wade through it!|
The extreme tonal range of this image makes it a tough shot for many digicams, which is precisely why I set it up this way, and why I shoot it with no fill flash or reflector to open the shadows. The object is to hold both highlight and shadow detail without producing a "flat" picture with muddy colors, and the C-50 Zoom did a good job.
The shot at right was taken with a +0.7 EV exposure compensation adjustment, though the slightly high contrast results in dark-looking midtones. (Increasing the exposure compensation only blows out the highlights further.) I chose the Daylight white balance for the main series, though color balance is a bit warm and yellow. (The Auto setting produced nearly identical results.) In fairness to the camera though, this shot was snapped a bit later in the day than usual, so the afternoon sun had a warmer cast to it anyway.
Skin tones are a little yellow from the warm cast, and the blue flowers in the bouquet are dark and a little purplish. (This is a very difficult blue for many digicams to get right. For reference, the flowers are a fairly pure light navy blue.) The C-50 also oversaturates the red flowers in the bouquet somewhat, producing a slight halo around the brightest areas that loses detail. Overall though, despite the cast and saturation, I find the color from the C50 very pleasing.
Resolution is very high, with a lot of fine detail visible throughout the frame, but limited detail in the shadows. Details are a touch soft, but definition is still quite good. Image noise is low in the shadows. A good job overall.
To view the entire exposure series from zero to +1.3 EV, see files
C50OUTDP0.HTM through C50OUTDP4.HTM on the thumbnail
Excellent resolution and detail.
Overall results are similar to the wider shot above, and the C-50's 3x zoom lens helps prevent distortion of Marti's features. Marti's face and hair show incredible detail, though details are again slightly soft throughout the frame. (This is almost an embarrassing amount of detail, I won't show this to Marti 1:1 on-screen. ;-) The shot at right was taken with +0.3EV of exposure compensation, which loses a little detail in the strongest highlights, but results in a pretty good exposure overall. Shadow detail is moderate, with low noise.
To view the entire exposure series from -0.3 to +0.7 EV, see files
C50FACDM1.HTM through C50FACDP2.HTM on the thumbnail
Indoor Portrait, Flash:
Underexposed with the built-in flash at the default exposure, but color is pretty good, and a little positive exposure compensation helps greatly.
The C-50's built-in flash underexposed this subject a fair bit at its exposure setting, requiring an adjustment of +1.0 EV to get a bright exposure. Overall color is pretty good, despite a pink-orange cast on the back wall from the incandescent background lighting, which also spills onto Marti's features slightly. I also shot with the camera's Slow Sync flash mode, which attempts to balance the exposure by allowing more ambient light into the image with a slower shutter speed. Even with an exposure compensation adjustment of +1.0 EV here though, the shot is still rather dark. (Compare to the very dim default exposure.) Still, the longer exposure dispels the pinkish color cast, and produces more even lighting.
To view the entire exposure series with the normal flash mode from
zero to +1.3 EV, see files C50INFP0.HTM through C50INFP4.HTM on the
thumbnail index page.
Indoor Portrait, No Flash:
Warm color casts with both white balance settings, but exposure is good.
This shot is always a very tough test of a camera's white balance capability, given the strong, yellowish color cast of the household incandescent bulbs used for the lighting.The C-50's Auto and Incandescent settings both had trouble here, producing very warm color casts. I chose the Incandescent image for the main shot, as it had slightly less warmth. Marti's skin tone and white shirt reflect the warm cast, as do the flowers in the bouquet. (The blue flowers are very dark and purplish, though it's probably to be expected, considering the light source.) The shot at right has an exposure compensation adjustment of +1.0 EV. Following are abbreviated exposure series for both white balance settings. (While the +1.3 EV shots show less color, I felt they lost too much detail in the highlights, and looked rather washed out.)
Great resolution and detail, although a warm color cast again.
The C-50's Auto and Daylight
white balances both resulted in somewhat warm, yellow casts. Resolution
is very high, showing a lot of fine detail in the tree limbs and shrubbery.
(In fact, the five-megapixel C-50 is stretching the limits of this poster
as a test target.) Details are slightly soft throughout the frame, with
increased softness at the corners and vertical edges.
Lens Zoom Range
A typical 3x zoom range.
I routinely shoot this series of images to show the field of view for each camera, with the lens at full wide angle, at maximum telephoto (3x, in this case), and at full telephoto with the digital zoom enabled. The C-50's lens is equivalent to a 38-114mm zoom on a 35mm camera. That corresponds to a moderate wide angle to a medium telephoto. Following are the results at each zoom setting.
Good color with the Daylight white balance, with great detail.
This shot is often a tough test for digicams, as the abundance of blue
in the composition frequently tricks white balance systems into producing
a warm color balance. The C-50's Auto white
balance setting fell victim to this trap, producing a reddish image.
The Daylight setting did much better, producing
pretty accurate colors and skin tones. Even with the slightly cool cast,
the blue background has purplish tints that aren't in the original image.
The blue robe looks nearly right though, with only very slight purplish
tints in the shadow areas. Resolution is very high, with great detail
in the embroidery of the blue robe. (This original data file for this
poster was only 20MB though, so the C-50 is definitely capable of showing
more detail than the poster has in it.)
About average macro performance.
"Davebox" Test Target
Good overall exposure and color.
Both the Auto and Daylight
settings produced slightly warm images, with the Daylight setting producing
the stronger cast. Exposure is pretty good, and the C-50 distinguishes
the subtle tonal variations of the Q60 target quite well. The large
color blocks are bright and vibrant, with good overall saturation. (The
red, green, and blue additive primary colors look just a bit oversaturated
to my eye, however.) The shadow area of the charcoal briquettes shows
moderate detail, with about the same level of noise. The last steps
of both vertical gray scales are also just barely visible. A good job
Great low-light performance, with good color and exposure, but noise is fairly high.
The C-50's adjustable ISO setting, combined with a maximum exposure time of eight seconds, results in good low-light shooting capabilities. The C-50 produced clear, bright, usable images down to the 1/16 foot-candle (0.67 lux) limit of my test at ISO 320, to 1/4 foot-candle at ISO 160, and to 1/2 foot-candle at ISO 80. Color was just a little warm across the board. One thing the C-50 doesn't offer is a noise reduction option, something of a departure for higher-end Olympus cameras. Although there isn't a lot of noise present, the actual noisy pixels are quite bright. Even at ISO 80, several bright pixels dot the image. The Median Filter option in Photoshop(tm) can quickly eliminate the worst of the noise, but for the ultimate treatment, see Mike Chaney's Qimage Pro program. The table below shows the best exposure we were able to obtain for each of a range of illumination levels. Images in this table (like all of our sample photos) are untouched, exactly as they came from the camera.
Flash Range Test
Good flash intensity, all the way to 14 feet.
In my testing, the C-50's flash illuminated the test target all the way out to 14 feet, with only a small decrease in intensity. Below is the flash range series, with distances from eight to 14 feet from the target.
High resolution, 1,250 lines of "strong detail." High barrel distortion at wide angle though.
The C-50 performed very well on our "laboratory" resolution test chart. It started showing artifacts in the test patterns at resolutions as low as 800 lines per picture height, in both horizontal and vertical directions. I found "strong detail" out to at least 1,250 lines, "Extinction" of the target patterns didn't occur until about 1,650 lines.
Optical distortion on the C-50 is rather high at the wide-angle end, where I measured approximately 1.05 percent barrel distortion. The telephoto end fared much better, as I found only three pixels of barrel distortion there (about 0.1 percent). Chromatic aberration is moderately high, showing about five or six pixels of coloration on either side of the target lines. (This distortion is visible as a very slight colored fringe around the objects at the edges of the field of view on the resolution target.) With the lens at telephoto, there also seemed to be quite a bit of flare at the boundaries of the dark target elements.
Resolution Series, Wide Angle
Resolution Test, Telephoto
Viewfinder Accuracy/Flash Uniformity
A tight optical viewfinder but more accurate LCD monitor.
The C-50's optical viewfinder is pretty tight, showing 84 percent frame accuracy at both wide angle and telephoto zoom settings. The LCD monitor is much more accurate, showing about 97 percent frame accuracy at wide angle and telephoto. Given that I like LCD monitors to be as close to 100 percent accuracy as possible, the C-50's LCD monitor performs well here. Flash distribution is fairly even in the center of the frame at wide angle, but falls off a little in the corners. At telephoto, flash distribution is more even, and the exposure was a bit brighter as well.
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