Red Filter with a 37mm thread which fits over the housing's port and can be installed and removed during the course of the dive. The Red Filter is used to restore the red color absorbed by the water. In shallow depths, these filters can serve as an attractive alternative to artificial light sources. 

MAIN FEATURES:

• Color-correcting filter created specifically to correct colors in Caribbean or tropical blue-green (cyan) water.
• With sunlight and the CF-M37 filter, you capture the natural colors of ocean corals, fish and aquatic life in lakes, streams and rivers.
• This filter "neutralizes" the underwater blue colors so that the true colors which already exist can be recorded on film or video.
• It can be removed unterwater.
• Can be mounted on 37mm threaded lens ports or other lens ports by using an adaptor. 
• The filter can be mounted outside housing directly in between the port and the attached wet lenses.
• Additional 40.5mm threaded lenses can be attached onto the filter.