Looking at Ken Lee’s web page on APO Ronars, mtfs of longer FLs show low contrast at working aperture’s, though aberations such as distortion, astigmatism and curvature of field look good if these calculated mtfs can be realized in reality.
I go back to the very expensive Schneider 800mm f12 apo tele Xenar as a better choice perhaps provided it can be used in closeup work. Nikon did not recommend the T series for this kind of work, so…
Any other choices? Did Fuji offer something longer than 600mm?
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