A Al Kaplan Veteran Local time 6:22 PM Joined Dec 7, 2003 Messages 4,463 View My Gallery Nov 22, 2009 #21 I don't know how they do it but the 15mm Heliar is just fine at f/11. There should be all sorts of diffraction artifacts but I don't see them.
I don't know how they do it but the 15mm Heliar is just fine at f/11. There should be all sorts of diffraction artifacts but I don't see them.