The #126 Nikon type adapter is a male “F” mount which adapts specific #2 or #3 housing types to user equipment fitted with a Nikon female “F” type lens mount. The adapter includes a dovetail ring that can be attached to the housing rear surface via the 2.00X40 TPI optical thread. Rotating the shutter to a desired orientation is attainable via (3) set screws in the “F” Type Male Adapter. This adapter can also be used with a housing configured with the #17 Nikon Female Adapter.