beano
Active member
I have the 400 4.5 here as well, and yes, it is a very good, lightweight setup. Haven’t done much shooting with that setup though, at most an hour or two of walking around.I always thought the Z50ii with the z 400 f4.5 would make a great combination for small bird photography. The combo would provide a 600mm field of view in a small/lightweight package. Reminds me of the D500/300mm f4 pf package with a 1.4 teleconverter.
I do find the 100-400 and 180-600 more practical, from the perspective of versatility. For smaller birds, the 180-600 gives me 900mm on the long end, and I am happy enough with sharpness and good contrast, even wide-open. The 400 4.5 is a fraction sharper, as well as better contrast, vs the 180-600, but with the variety of Birds in my neighbourhood, a bit limiting.