Which port do I use w/canon 17-40?

I just bought a Canon 17-40 F4.0L to use with my Canon 20D. I have an Aquatica housing. Which port am I supposed to use?

thanks,

Tov

Hi,

You should use the 8" dome port with the recommended Aquatica extension ring. Contact Aquatica or your dealer to get the right ring as it is very important. No diopter is required.

Good luck and have fun.

James Wiseman