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p.1 #8 · Show your 100-400mm at 400mm and wide open, please! | |
I find mine to be stunningly sharp wide open at 400mm, almost as good as the 500.
Here are two images, both taken handheld, both with the 1Ds3:
The first was taken with the 1.4x TC wide open at f/8

100% crop:

This was sharpened in PS
Here's another, this one was not sharpened in PS, only default Lightroom sharpening, taken with no TC wide open at f/5.6:

100% crop:

Detail in the features is lost but the 'teeth' on the bill are the clue to how sharp it is.
I am very pleased with this lens, haven't tried it on a 7D yet, hopefully in a few days, but I expect even on a 7D wide open performance at 400mm to be stellar (based on my experience with the 1Ds3 with the 1.4x TC).
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