Sea Frogs V5 Dome Ports with 55mm Extension Ring

Rated for depths of up to 40 meters (130 feet).

This dome uses a 80mm (3.15'') bayonet mount via the V5 extension adapter ring. Compatible housings are listed below.

Yes — this port includes its 55mm extension adapter ring.

Acrylic domes give excellent image quality in most conditions and are lighter, more affordable and repairable — light scratches can be polished out. Optical glass is slightly sharper in demanding conditions and far more scratch-resistant, but it cannot be repaired once it is damaged.

The 6″ dome delivers excellent image quality in most conditions while staying compact and travel-friendly, which makes it the usual choice. The 8″ dome gives slightly better edge sharpness and a cleaner over-under split shot, at the cost of size, weight and price.

Optically they are the same dome. The standard carries a petal lens shade, which keeps stray light off the dome and gives the rim some protection — the usual choice for diving. The Surf Edition leaves the shade off: there is less for moving water to push against, so the rig is easier to hold steady in the surf zone and there is nothing to catch when you punch through a wave.