On Thursday, February 4, 2021 at 1:38:33 PM UTC-5, Alfred Molon wrote:
If you look he
https://www.youtube.com/watch?v=eFFNZYNYxFQ

these lenses have absurd sizes.

Welcome to the land of long reach, particularly for birding...
....or of three letter agencies (at least, back in the days of film):

https://www.bhphotovideo.com/c/find/...l-L-Lenses.jsp


It's not something you would carry around for hours/the full day
while walking in a tropical rainforest.

How about while sitting in a blind for hours?

Oh, don't forget to add a suitably beefy tripod too...
....perhaps with a Wembley style gimbal.



-hh