johnf3f wrote in post #17800171
Additionally there is an extra piece of glass in the focal path which is not helpful for IQ. I have read that Canon did not include IS in their 24-70 F2.8 V2 to maximise IQ, I do not know if this is true or not (Canon wouldn't confirm/deny this to me) but I am loving the performance of my 24-70.
Yeah, and I'm loving the sharpness of my 70-200 IS II. I guess I'm OK leaving the design of the lens up to Canon and just evaluating based on performance. Instead of worrying about whether an IS element set degrades the theoretical maximum sharpness potential of a lens design I just look at the performance of the 70-200/2.8 IS II, the 100-400 IS II and the 70-300L IS (not to mention the 300/2.8 IS II, 400/2.8 IS II, 500/4 IS II, 600/4 IS II) and I don't see the problem.
Others have different needs/uses and may find IS very handy but for my (wildlife/landscape) needs it is more of a hindrance than a help. I would suggest trying your lens/lenses with IS off and see if it works as well for you as it does for me, if you don't like it then you can always turn it back on.
All the best.
And that's what I do. I'll admit I have not noticed any AF tracking problems with IS on, but I do tend to turn it off anyway when I'm shooting subjects that are moving fast.
Also, I'm kind of surprised you don't find it useful for wildlife (thinking of critters other than birds). So much of that photography is in low light, long distances and relatively slow moving subjects.
To sum up, I don't see any downsides to IS. Canon offers several stunning lenses that have IS as a mentioned above. In fact, Canon's highest resolving lenses all include IS. I was kind of curious about your statement that you would actively avoid IS. When you don't need the IS, you can turn it off. But if the lens lacks IS, you can't turn it on when you do need it.
There are a few specialists (full-time sports photography?) who might literally never make use of IS. But I think most people are generalists enough that they will encounter situations where stabilization is very handy.