Test Canonna 17-85 w Popular Photography

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W najnowszym wydaniu angielskiego Popular Photography ukazał się test canona 17-85. Pozwole sobie przytoczyć tekst tego testu:
"THE EQUIVALENT OF A 28–135MM
lens, Canon’s 17–85mm f/4–5.6 digitalonly
EF-S zoom ($600 street) is a logical
upgrade for Digital Rebel and 20D owners
ready to step up from Canon’s standard
18–55mm f/3.5–5.6 kit zoom. The
only EF-S lens with image stabilization so
far, the 17–85mm features third-generation
IS technology, which promises shorter
“wake-up” times, more aggressive subject
tracking, and tripod compatibility.
The obvious comparison is with Canon’s
28–135mm f/3.5–5.6 full-frame IS
zoom ($405 street, after rebate), which,
seven years on, remains popular, if only
because it’s the least expensive IS zoom.
HANDS ON: This matte-black lens is
noticeably smaller and lighter than the 28–
135mm. It has a large, ribbed, and rubberized
zoom ring, with a smaller but equally
grippable manual-focus collar. The turning
action for both is well-damped, if not super
smooth. Like the 28–135mm, focusing
scales are behind a plastic window, and
the white metric scale is more legible than
the green U.S. scale. AF action is fast,
accurate, and silent. Controls include Canon’s
AF/Manual and Stabilizer switches.
IN THE LAB: At the test focal lengths,
SQF performance is in the Excellent range.
According to DxO Analyzer tests, distortion
is well-controlled at 85mm and 50mm
(0.44% and 0.49% pincushioning, respectively),
moving into the Very Visible range
(1.25% barrel) at 17mm. Above average
for the field, this is a significantly better
showing than the 28–135mm IS lens
could muster: 2.70% barrel distortion at
28mm. Light falloff in the corners is gone
by f/8 at the longer focal lengths, and by
f/5.6 at 17mm—slightly above-average. At
the universal close-focus distance of 13.7
inches, maximum magnifi cation ratios ranged
from 1:14.1 at 17mm to 1:4.8 at 85mm,
about normal for its class.
CONCLUSION: With distortion under control,
an IS system that delivers three extra
stops of hand-holdable shutter speeds, excellent
sharpness, and more, this lens will call
out to any Digital Rebel or EOS 20D owner
who can afford the price of admission."
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