Lens choice for Socorro

I've been there 4 times.

I use the 12-24 the most.

10 -17 is also good though a lot of animals won't get that close.

I do agree the shots you get with the 10-17 will be the best, just not many of them for sharks, ect.

The Mantas I'd definetly would go with the 10-17, and I did spend a day at Roca Partida shooting a whale shark with the 10-17

I normally shoot the 10-17mm with a mini dome, but thinking of adding a 1.4x Kenko telextender for this location. What extension ring should be used with a 7D and Nauticam housing?

Hal

Thanks for the responses everyone. I want to ask about another option:

1. As with any TC, I know I’m going to lose some sharpness and focus speed at the expense of a bit more range. So if I crop a shot taken with just the 10-17, will it be sharper or softer than a non-cropped shot taken with the TC. If the cropped, naked 10-17 shot is as sharp, I don’t see the TC getting me anywhere.
2. Same question with the Canon 8-15. Since the reviews/tests I’ve read say the 8-15 is sharper (albeit for a cost), if I get the 8-15, will my cropped shots be sharper or softer than an uncropped shot taken with the 10-17 and the TC?

Any thoughts on this would be appreciated. Thanks.