I've been using my daughter's 15U's games as practice for various lighting approaches.

Here's some recent efforts.

1) ISO 3200, f3.2 1/250th bounced 580ex on camera

Just curious as to why use a high ISO with a flash in pics #1 & 4.

Hey Mark, lighting looks pretty good on all of these. But I'd have to say that #4 is just about perfect. Ambient in #2 also looks good, though a tad noisy (duh!). It's hard to find fault with #3, but maybe just a bit too harsh with the shadow more obvious. #1 is hard to judge for some reason. Glad to hear you're liking the 135L. Looks like you've got multiple lighting options that can work for you.

Fish -

There are a few reasons the ISO is that high.

!) I prefer the look of the flash balanced to the Ambient.

2) I prefer the look of bounced to direct. The ceiling eats up a bunch of light.

In #1, that gym is an absolute cavern. Ambient is pretty much ISO 3200 f2 1/200th

And if direct using on camera - you spend half your processing time trying to clean up demon eyes - (not redeye which you can fix with a click of the red eye tool, but completely blown out pupils which have to be cloned in.) from the same set of matches as #4.

Here's an example at ISO 400 with direct the shadows are just too harsh - especially with having the curtain so close. May have been able to get away with it in a big open gym.