Anyone using fisheye lenses and a waterproof bag ? I am using a digital slr and want to shoot from the water with a fisheye lens....

www.opteka.com have some stuff pretty cheap but wanted to know if anyone had tried it and if it worked well....I am pretty sure the bag will cause some problems with the fisheye adaptor but not sure how much...

Anywhere else people know of to get a good deal ?

I need Canon Mount for my camera- checked the price for a good fisheye and I really don't have that cash.

I am going to get some polarizing filters as well and a monopod...any ideas on where to get these ?