Ikelite 6441.16 Yellow Barrier Fluorescence Filter for 3.9 diameter 23D it emits an audible alarm

it emits an audible alarm and flashes red to warn you immediately to surface before it's too late

this kit will help you get the most out of your underwater camera

The cold forged

Exposure Adjustment:Exposure adjustments directly through the back of the housing put the perfect shot within reach every time

The camera mounting plate allows ready access to the battery and memory card

Ikelite 6441.16 Yellow Barrier Fluorescence Filter for 3.9 diameter 23D it emits an audible alarmTo see this underwater, you'll need a light with a dichroic "excitation filter" attached AND a yellow "barrier filter" on your mask and camera system. What you'll generally see is a glow emitted from a variety of corals and animals, mostly in greens, blues, and reds. You may find two of the same type of coralsone which fluoresces, and one which doesn't. Dive your favorite spots in a different light and see what you've been missing! Fluorescence is