Originally posted by lkjr I am trying to make a final decision for a lens to shoot indoor gymnastics where we can't use a flash and the distance can be far. I have a Kx and while my 55-300 has the distance, it often doesn't have the speed for these low light conditions. I have pretty much eliminated the 50-135 (people say its focus is too slow..unless you can convince me otherwise) so I am down to a) sigma 50-150 f2.8 (~$750), b) tamron 70-200 f 2.8 (~$730), or c) maybe the DA 200 f2.8 (but this is about $950). (The Sigma 70-200 is way too expensive...why?) Any thoughts? Thanks!
You mention a 50-150 as an option. If that is long enough you might consder the Takumar 135:2.5. It is manual but very good and inexpensive compared to your listed alternatives. A good way to wet your manual feet!
Dave
PS I'd try increasing ISO a lot with the DA 55-300 first. At 200mm the lens is f:4.5 - not too bad.
Doubling ISO is equivalent to adding a stop. So if you find that f:4.5 at ISO 3200 is ok from the standpoint of motion freeze, f:3.2 would be ok at ISO 1600, f:2.3 at 800, etc.
Similar tests can be done to determine what ISO is good enough for you. Just shoot an ISO series ( perhaps varying noise reduction settings too) of a static subject & decide what's good enough.
These simple tests will help identify what lens you actually need to do the job you want done.
Or just buy a good 200:2.8 and be done with the agonizing.