Canon EF 70-300mm f/4-5.6 USM IS - Full Format Lab Test / Review
Lens Reviews -
Canon EOS (Full Format)
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Review by Klaus Schroiff, published November 2010
Lens kindly provided for testing purposes by Christoph Siegwart!
The Canon EF 70-300mm f/4-5.6 USM IS is one of the older IS lenses available today.
It replaced the old EF 75-300mm f/4-5.6 USM IS which was the first Canon IS lens to hit the
market back in 1995. It is an immensely popular lens especially among APS-C users but it is
a native full format lens so for the sake of completeness let's have a look how it behaves
within this scope.
Compared to its predecessor it has been improved in a number of aspects. The most significant
change is a redesign of the optical construction which now features a UD element.
The AF speed has been significantly improved to a very decent level although it doesn't quite
reach the speed of Canon's ring-type USM lenses. Thanks to a micro-USM drive the noise level
is very low. The lens does not feature FTM (full-time manual focusing in AF mode) though.
One key selling factor for this lens is naturally the Image Stabilizer (IS). Camera motion is detected
by 2 gyro sensors which measure the angle and speed of the shake. This information is used to shift
a lens group off the optical axis (basically a forced decentering) to counteract this motion.
The result is a significant improvement of handholdibility under extreme conditions.
Canon improved the efficiency of the mechanism to an equivalent of 3 f-stops (up from 2 f-stops).
The IS now offers 2 different modes (instead of just one):
- mode (1) for static scenes where the IS corrects shake both vertically as well as horizontally
- mode (2) for action photography (object tracking) where only vertical shake is corrected
The build quality of the lens is about average. Neither the focus nor the zoom control ring is
especially damped but it operates quite smooth. The various switches feel a little cheap. As you
can see in the product shot below the lens extends significantly during zooming (typical in the lens
class) and the front element rotates during focusing operations so using a polarizer is a little
cumbersome at best. Another new feature is a transport lock that prevents zoom creeping.
Here's a comparison with its nearest cousins:
EF 70-300mm f/4.5-5.6
USM DO IS
EF 70-300mm f/4-5.6
AF 70-300mm f/4.5-5.6
||18 elements in 12 groups, 1x DO element
||15 elements in 10 groups, 1x UD element
||17 elements in 12 groups, 1x LD + 1x XLD element
|image stabilizer efficiency:
||3 f-stops, 2 modes
||3 f-stops, 2 modes
||ring-type USM with FTM and non-rotating front element
||micro-USM, no FTM, rotating front element
||USD (Ultrasonic Silent Drive), FTM, non-rotating front element
|approx price tag: