There is a macro lens for the 2G, it is the 125 lens. You will also need a ring adapter to attach the lens to the bayonet mount on the camera. Below is the description on the Sea&Sea website. If you go to the website, click on "Accessories for Compact Digital Housings" and then scroll down to the 125 lens description.
Close-UP Lens 125
(Product No.52119)
*Enlarged image
[ Specifications ]
[Lens construction] 2 elements in 2 groups (multi-coated)
[Focal length] 125mm (equivalent to close-up lens No.8)
[Dimensions (DIAxD)] 74x9.5mm / 3x0.4inch
*The appropriate Close-UP Lens Ring is required to attach to the DX-2G / DX-1G / DX-1200HD housings. (Magnification can be multiplied by stacking them.)
*When the zoom of the digital camera is close to the maximum wide angle end, the four corners of the picture may darken. To correct this, move the zoom control slightly toward the telephoto side.
Instruction Manual for "Close-UP Lens 125"(0.25MB)
Regards,
Bill