Blackwater photography is a challenging craft that is done during a night dive that used dive lights to attract underwater creatures, which needs photographers to compose and shoot pic while diving and controlling buoyancy in the deep sea. 

Lighting and buoyancy are the most challenging during your blackwater photographing times. For lights, It's recommended you want a video light for 2000-4000 lumens, OrcaTorch D900V is probably maybe your top choice. It is an underwater video light in 2200 lumens with 120° wide beam & 8°spot beam, It can be either focus light or wide-angle light. Besides, it has three lighting sources: red, UV, neutral white. 

The reason why you use a focus video light is to get rid of the shadow cast by the two lights that are out on your arm. when you set those lights out of the arm, make sure the light beam intersects right where your subject isn't going to be, and in black water, with all the super macro setups you're gonna have that subjects gonna be like just a couple centimeters in front of your lives. So you can really minimize the backscatter and the seasickness effect just by manipulating analytes correctly. 

A streamlined camera is also a good tool for underwater photographers. You can set your ISO set somewhere around 1600 maybe 3200, you're shooting 60 frames per second and your shutter speed is 1/120 to maintain the two-two-one rule. In this way, you basically got everything set to make sure you grab a ton of light the higher your shutter speed the more light you're going to need the higher your frames per second same thing more light. So you can capture more ideal photography.

Another aspect is about backscatter. As we know, backscatter may destroy your beautiful pic. To reduce this situation, you should use two underwater strobe lights far from the lens and just use the edge of the light beams to light up the underwater creatures.

Blackwater photography is different from usual underwater photography, it's more challenging and dangerous because its diving is done in very deep water, where there is no bottom. But the rewards are also greater!