[couplos]

BIF with a canon fd 600mm 4.5 ?

i guess i should do some exercice to get some more muscles,

for this purpose my 400mm f5.6 and my 70-300mm zoom should do the job,

 

about the 150-600mm ziooms,

with a 1.4 converter on my 400mm i am near,

is it really worth upgrading ? (getting only 2/3 stops better)

 

still a question remains,

is a mid-priced spotting scope an option (refractor or mirror),

is a canon fd 600mm f4.5 still good enough,

i know they are heavier  and only MF,

and i will probably have to change my tripod,

 

kr,

couplos