Keith Reeder
Watch the birdie...
Thanks, Adey.
I Just bought a 40d to get the 1.6 crop back on my 500mm as it can be a bit short on the mk3 (650mm) 800mm with 1.6I agree with Nigel an 800 f4 would be far more tempting, I think I'll stick with my 600 + 1.4 for now. I also would be impressed if canon would bring out a 1.7x converter which would still focus on the non 1D series, and it would open up a whole lot more possibilities for the 500/600 users. What do you think ?
500mm = 850mm + 1.6 crop factor = 1360mm (instead of 1120mm with 1.4x)
600mm = 1020mm + 1.6 crop factor = 1632mm (instead of 1344)mm with 1.4x)
of course it would cost you about 1/3 of a stop above the 1.4 times but at least is wouldn't be as soft as the 2x
cheers
Jamie
I agree with Nigel an 800 f4 would be far more tempting,
Jamie
Perhaps I misundertand my physics but I think a 800mm fl f/4 scope would require a clear aperture of 200mm and weigh as much as a small motorcycle.
Perhaps you do indeed, the Pentax 67, 800mm f4 weighs in at 17.7 Kg and is 236 mm in diameter and 611mm long
I assumed we were talking about 35mm telephotos - this is a medium format lens for the Pentax 67 body.
It's equivalent 35mm focal length is 400mm.
Go here:
http://www.bhphotovideo.com/c/product/40784-REG/Pentax_29434_SMCT_67_800mm_f_4_Lens.html