bpark42 wrote in post #13691812
I'm not sure what you mean by "viable" here. If you mean very low shutter speeds it won't really matter since you won't be able to stop any motion at that point anyhow. If you mean "not allowed" I suppose this is possible, but I can't recall a show where I was not permitted to use one, including national level events.
I agree that the IS version of the lens is preferable to the non-IS, but given the choice between a 40D + 70-200IS vs. 7D + 70-200non-IS I would take the 7D/non-IS combo every time. The extra high ISO capabilities will be far more useful than the IS for indoor shows.
Yes, I meant not allowed; however, that was more of a general caution about arenas and other large, public gathering spaces. It sounds like you've got some experience with the horse arenas and that might not be as much of a concern.
As far as the combo question, it would depend. If you are able to maintain shutter up to 1/160, I would actually prefer the non-IS on the 40D than the 7D. The 7 is SO finicky about camera shake at telephoto lengths that below 1/320 you'd see less shake in the 40 using the non-IS. That was my biggest adjustment when I upgraded; caring a bit more about keeping those speeds up, even with IS...
Where do shutter speeds max out, in this sort of lighting, with the 40D and at what ISO/apertures?