Have my eyes on a Canon EF 100-400mm 4.5-5.6L IS USM lens, due to the reach of it.
However, I HAD my eyes on the Canon 70-200 f2.8L USM lens, for it's moderate reach, and the speed.
On a 20D, both lenses are 1.6x longer, which is fine and dandy for the application.
I like the speed of the f2.8 much better though, and was wondering, if it would be a photo-sin to throw a teleconverter on that lens, to get the reach out to the 100-400 area. Even losing a stop or 2, it'd still be faster than the 100-400 (right?).
Will image quality suffer? I don't have any experience with Canon's TC's (or any for that matter), but I know there is a 1.4x, and a 2.0x that'll work with the L lenses.
Thoughts?
Thanks a bundle,
10k