Aluminum double-ball arm, pair

Arms exist to get the light away from the lens. Every dive in the Red Sea has particles in the water, and a light mounted right beside the port lights up the specks between the camera and the subject, which turns into the white snow called backscatter. Pushed out to the sides and slightly behind the port, the same light hits the fish and misses most of the water in front of it. These are the plain building blocks for that: skeletonized aluminum, 50 g (1.8 oz) each, standard 1 inch balls with O-rings, joined to each other and to a tray with ordinary 1 inch clamps. A 1/4 inch thread in the middle takes an extra ball if you want a third joint. Also sold in 7, 9 and 11 inch.