Welcome to the diving and photography site of Pieter van der Velden
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For photography I mainly use a Nikon D700. Underwater I still use my D200. The following lenses are used:

Sigma 150mm F2.8 EX APO DG Macro
Sigma 15mm F2.8 EX DG Fisheye
Sigma 100-300 F4 EX APO DG HSM
Nikkor AF-S 17-35mm f/2.8D IF-ED
Nikkor AF 50mm f/1.4D
Nikkor AF 85mm f/1.8D
Nikkor AF Micro 55mm f/2.8D

My most recent additions are the:
Nikkor AF 85mm f/1.8D
Sigma 150mm F2.8 EX APO DG Macro
Sigma 100-300 F4 EX APO DG HSM
Nikkor AF-S 17-35mm f/2.8D IF-ED
Nikkor AF 50mm f/1.4D

Underwater I use the following:

Ikelite Housing for the D200
Two Sea&Sea YS-90 Strobes
One Sea&Sea YS-30 Strobe
Nikon D200