As a professional photographer and University photo instructor for 20 years
let me suggest that the problem with sharpness with the 28 -135IS lens is in
the shooting technique, not the quality of the lens itself.
The first time I used this lens the results were terrible compared to shots I
took at the same time with the 85f1.8 lens. They were very unsharp, they
looked like they had been taken through a coke bottle. The problem was my
shooting style. As a photojournalist I am use to bringing the camera to my
eye and immediately shooting the picture. This won't work with the 28-135IS.
You need to hold down the shutter button partially for a split second to
fully activate the stabilizer before fully depressing the shutter and taking
the picture. If you do this the lens is very sharp, better than my 28-105
simply because it goes to 135mm if nothing else. As with any multi-element
zoom it is essential to use the lens shade designed for that lens to prevent
flare and keep the contrast up. Canon should provide with the lens like they
do with their L lenses. I can always tell a poorly trained photographer by
his lack of a hood on his lens. One final bit of advice in getting the best
quality from this lens, if you are going to use filters on it use the very
best multi-coated from Hoya, B&W, or God forbid, Nikon. Any lens is only as
good as the glass [filters] it is shooting through. If you want to turn a
good lens into a lousy one, put a cheap filter on it. Well that is my 2
cents, I'll get off my soapbox now.
Mike Dziak
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