It's no dog. But it certainly wasn't engineered for full aperture usage. Nor were any of these. I'm not a tele user myself, but do know people who have had exceptional outdoor photography careers reliant on the Fuji 400T. I've seen a lot of those shots enlarged to 40X60 inches; and it was the tele of choice for some superbly published expedition work such as that of Shirahata in the Himalayas and Karakoram. Atmospheric conditions are more of a factor in tele work sharpness rather than nitipickiness over modern multicoated optics. Going non-tele with apo process lenses would be better than all the above, but of course would involve very long bellows extensions more suited to monorail work. But you seem to have certain other priorities in mind rather than sharpness per se, or even than serious weight reduction. You didn't even mention what specific camera this is for.
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