Morning All,
After a lot of reading on forum, researching on prices and generally delaying spending money I seem to have narrowed down my choice to two lenses:
Tokina 10-17mm f/3.5-4.5 Sigma 15mm F2.8 EX DG Diagonal Fisheye
I am leaning towards the Sigma as it is a prime and i gain a couple of f stops, I have a 50mm prime I use on land and I like how crisp the images are compared to 'normal' zoom.
For reference I am currently using a Canon EOS (mirrorless) with a 22mm lens in a housing, but will be taking my DSLR underwater once I can save the funds for strobes then a housing.
Cheers
Andrew