Test Results In keeping with our standard test policy, the comments given here summarize only
our key findings. For a full commentary on each of the test images, see the Canon
PowerShot Pro90 IS' "pictures" page.
As with all Imaging Resource product tests, we encourage you to let your own eyes
be the judge of how well the camera performed. Explore the images on the pictures
page, to see how the Pro90 images compare to other cameras you may be considering.
Overall, the Pro90 did a great job with color balance, overcoming the challenges
of our most difficult lighting situations. We used the automatic and manual white
balance options during most of our testing, although the white balance presets
produced accurate results in most cases, differing only minutely from the automatic
settings. The Pro90 reproduced the large color blocks in the Davebox test target
quite well, with good saturation. Tonal handling was also good, as the subtle
tonal variations of the Q60 target were visible up to the "B" range,
and the small blocks in the vertical grayscales were distinguishable all the way
into the deepest shadows. We did notice slightly oversaturated red tones in a
few of our test images (mainly the red flowers in the outdoor portrait), but overall
color balance was remarkable throughout our testing.
The Pro90 also performed very well in our "laboratory" resolution test,
with excellent detail visible to 900 lines per picture height and beyond, in both
horizontal and vertical directions. The onset of aliasing (slightly jagged appearance
in the fine details, barely perceptible as thickening and thinning in the lines)
at 750 lines per picture height prompted us to "call" the resolution
at 750 lines in both directions. (It's almost a toss-up though, to rate it at
800 lines...)
We appreciated the Pro90's very flexible exposure system, which offers as little
or as much control as you need. In addition to the standard Automatic, Program
AE, Aperture Priority, Shutter Speed Priority, and Manual modes, the camera also
provides a handful of programmed Scene modes that you can use when you're at a
loss as to how to handle specific lighting or focusing situations. In addition,
the user is given control over flash mode and power, metering, exposure compensation,
ISO, AE / FE Lock, white balance, sharpness, contrast, and color saturation.
The Pro90 performed very well in the low-light category, as we were able to obtain
very bright, usable images at light levels as low as 1/16 foot-candle (0.67 lux)
at the 100, 200, and 400 ISO settings. (An excellent performance in a really dark
scene!) At the 50 ISO setting, we could see the target at the 1/16 foot-candles
light level, but the image was just a little too dim. As we expected, noise levels
were the highest at the 400 ISO setting, with a much larger grain pattern than
the slower ratings. At 50 and 100 ISO, noise was minimal, even at the darkest
light levels. To put the Pro90's low-light performance into perspective, one foot-candle
of light equals the overall lighting conditions of an average city night scene
under modern street lamps. Based on our results, the PowerShot should easily handle
even darker situations.
Since the Pro90 features an electronic SLR design, we measured the viewfinder
accuracy using the larger LCD monitor on the back panel. We found the LCD monitor
to be very accurate, measuring about 98 percent at both wide angle and telephoto
settings (for all three resolutions). Since we generally like to see LCD monitors
as close to 100 percent accurate as possible, the Pro90 does an excellent job.
The Pro90 also did well in the macro category, capturing a minimum area of 4.40
x 3.30 inches (111.74 x 83.80mm). Color, detail, and resolution all looked great,
though we picked up a low level of noise in the gray background. Printing details
on the dollar bill were slightly soft, but the coins appeared reasonably sharp.
The Pro90's built-in flash had a little trouble throttling down for the macro
area, producing a bright reflection on the brooch, and a large shadow area extended
across the bottom of the flash image, indicating that the flash was partially
blocked by the rather long lens.
The Pro90 performed very well throughout our testing, handling our toughest light
sources well, and coping with low light levels with ease. Resolution was great,
as was overall image quality, and the variety of exposure controls makes the camera
very flexible in a wide variety of shooting situations. Though its macro capability
is slightly less than average, the Pro90's 10x zoom lens and Image Stabilizer
technology more than make up for it! Overall, we were very pleased with the Pro90's
performance.
Conclusion
Canon's earlier PowerShot Pro70 received wide acclaim for its excellent picture-taking
capabilities, with excellent optics and beautiful, accurately-rendered images.
The Pro90IS is a very worthy upgrade to the earlier product, carrying on the tradition
of image quality, but now adding the power of a 10x Image Stabilizer lens and
a 2.6 megapixel CCD. The intervening time has also brought advances in the CCD
and camera circuitry, with the result that the Pro90IS is also capable of low-noise
image captures in very low light conditions as well. By offering a wide range
of preset exposure modes along with flexible manual exposure options, the Pro90IS
will appeal to serious amateurs and less-committed family members alike. All in
all, a very nice picture-taking package, entirely worthy to carry on the PowerShot
"Pro" heritage!