Nikkor 180mm Tele

I purchased this tele for astronomy purposes. </span></p><p><span>&nbsp;</span></p><p><span>Check all my images made with it below. Usually I have an extrenal IDAS LPS attached which brings the lens to F3.5. There will be no diffraction spikes if the lens itself is set to F 2.8. However I tempt to use F4 or even F5.6 to increase sharpeness. I find focusing difficult as the exact focus point for infinity is not matching the visual best point when using live view to focus. See all further comments on the excellent article that Jerry Lodriguss made: