Hi Folks,
I have been shooting an S2pro in the Ikelite housing since August. I own a flat port and the extended dome port.
Behind flat port:
Nikkor 60mm Micro
Nikkor 28-85
Extended dome port:
Sigma 14mm EX
Nikkor 18-35 ED with +4 closeup lens
I tried the 28-85 only because I already owned it for topsides shooting. It sucked underwater.
I know that others have used the Nikkor 105mm and the Nikkor 20mm.
Cheers
James