Due to refraction flat ports reduce the angle-of-coverage of a lens and at the same time enlarge the image, ideal for shooting small subjects with a standard, macro or zoom lens. Note that if a port is long enough to accommodate the full length of a 1:1 macro lens, the lens may vignette at infinity when used behind a flat port
A special extension is available for use with Nikon 105mm VR Macro and Canon 100mm USM Macro lenses. Manual focus is adjusted with a large, easy-to-turn knob on the side of the extension. For use with either #5510.16 or #5510.22 Port Bodies.
Unlike the standard focus ports for these lenses, this combination allows the user to alternate between manual and auto focus while the camera is installed..
An appropriate Port Body is required to attach a Flat or Dome Assembly to the housing. Port Bodies are offered in a variety of lengths for use with different lenses. Please note that picture sharpness is very sensitive to port length when using a dome underwater, while the optics of a flat port underwater are very forgiving. We recommend selecting a port body based on your wide-angle or zoom lens...
#5510.09 Locking Device
A new locking device prevents unintentional detachment of the 8" dome and superwide body when installed on either a 2-lock or 4-lock housing. The "L"-shaped safety device limits the port's angle of rotation and attaches and detaches with a thumbscrew for quick and easy port changes.
The locking feature is included with all #5510.11 Superwide Port Bodies. It is also av..