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Originally Posted by Striker
I still reckon you should go for the Canon 400mm F2.8....Bert
Move on...lol
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There is one at Camera Exchange in Melbourne for Aus 7K.When I saw it I left straight away.It was used but looked to be in good condition.When a pro photographer hangs on to a lens,it is very good.Beware of near new expensive glass it is most probably not up to specs.
I calculated the theoretical diffraction limit (Airy Disk) of my lens at F2.8 if it was perfect,and came up with four micron at a wavelength of 500nM (green).If you look carefully at dim stars they are about 3 to 4 pixels.This corresponds to 15 to 20 micron.Not bad for a multi element real lens in the real world.
Bert