jeetsukumaran Offline Upload & Sell: Off
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FWIW, I've compared the 2.8 and 4 IS versions of the lens extensively recently, and describe my findings here:
https://www.fredmiranda.com/forum/topic/1502301/0#14129356
TL;DR --- the f/2.8 is optically the best, of course, especially wide-open and in edges/corners. But the f/4 IS is very, very, very, very good, and, in the center, arguably as good as the f/2.8.
Now, these were not for (pseudo-)macro applications, and I did not test it here (since the f/2.8 does not even do pseudo-macro), but while I did have the f/4 IS in my hands I did take some close-up shots and, frankly, they were spectacular! In fact, I would say this is where the lens really took my breath away. I would say that, at least in the main part of the frame it is about as good as it gets, with the only issue being it does not go to 1:1, but, honestly for most subjects frog-sized and up, that's enough.
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