10-12-2012, 11:55 AM
My "go to" wildlife lens is the 100-400L without hesitation, as I find the zoom function invaluable. It might not be "prime sharp" but personally it is more than good enough.
Since you do have the 70-200 already, I think it is worth trying to get your hands on a 2x converter and try it out for yourself. That would seem to be the lowest cost approach, even if in that condition you might need to go down a stop to help.
Just to throw in another possible consideration, the Sigma 120-300 f/2.8 OS HSM etc... the current version seems to have taken a bit of a dip in price since they announced the "S" version, so it isn't a massive amount more than an 100-400L for example. Of course you'll need extenders for that also, but you get up to 600mm with AF in that case. This lens does take a stop down to get the best sharpness out of though. And it is heavy!
Since you do have the 70-200 already, I think it is worth trying to get your hands on a 2x converter and try it out for yourself. That would seem to be the lowest cost approach, even if in that condition you might need to go down a stop to help.
Just to throw in another possible consideration, the Sigma 120-300 f/2.8 OS HSM etc... the current version seems to have taken a bit of a dip in price since they announced the "S" version, so it isn't a massive amount more than an 100-400L for example. Of course you'll need extenders for that also, but you get up to 600mm with AF in that case. This lens does take a stop down to get the best sharpness out of though. And it is heavy!
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.