p.2 #1 · Deciding between Nikon 600mm z 6.3 vs 400mm z 4.5 with TC1.4
ilkka_nissila wrote:
Not meaning to nit pick but there is no Nikon PF 400 mm. The 400/4.5 is so light weight that I too would have guessed it to be a phase fresnel design but it's not.
p.2 #2 · Deciding between Nikon 600mm z 6.3 vs 400mm z 4.5 with TC1.4
The 400 DO and DO II indeed use diffractive optics as do the Nikon PF lenses.
The Canon 800/5.6 are, however, conventional refractive optics, not DO. The reason the RF 800/5.6 is so short compared to its predecessor is that they went with a design which uses a teleconverter-like rear group on a 400/2.8. It allows close focus and a more compact overall design but does not use DO.
billsnature wrote:
Canon 400 DO f4 and Canon 800mm f5.6
