This port body works with lenses up to 2.6in in flat ports or up to 2.75in in dome ports. This port base is compatible with the new in four lockin style Digital SLR Housings. This Port Body is optimized for super-wide lenses, and works in conjunction with either the Ikelite 8in Dome Port with Shade and Cover or the Ikelite 8in Dome Port with Shade and Cover Please refer to the Ikelite Port Chart for Nikon or the Ikelite Port Chart for Canon for individual lens compatibility requirements. This Port Body utilizes a bayonet style mount that requires #9072.24 low-profile port locks. These port locks come standard on all housing models manufactured since March 2006 and can be used with any Ikelite port. Low-profile port locks are not compatible with older Ikelite film SLR housings.