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The BlurFix3+ 55 Adapter, from SNAKE RIVER PROTOTYPING, is a 55mm filter adapter for the GoPro HERO3, HERO3+, and HERO4 standard underwater housing. It slips over the housing and leaves a completely sealed space between the housing and the filter. It can be used in three configurations: unsealed, sealed/air filled, and sealed/liquid filled. (Please see below for descriptions of the three.)
Three different-sized O-rings are included for sealing against a filter. They're compatible with most 55mm filters, including Tiffen CPL, Tiffen ND, Marumi CP, and Zeikos UV. (Zeikos CP and Rocketfish CP are not compatible.)
When used without one of the O-rings, the BlurFix3+ 55 acts as a "wet filter" adapter. Holes at the top and bottom of the filter easily allow the space between the filter and housing to flood. This configuration is commonly used during dives with a color-correction filter. It's also the easiest configuration to use on land when rain, mud, or snow intrusion is not probable.
Sealed / Air Filled Use
In environments where rain, mud, or snow may be forced between the filter and camera housing, the space between the housing and filter is best off sealed. And this is easy to do if using the correct size O-ring. Capturing air between the filter and adapter is the simplest approach in most environments.
Sealed / Liquid Filled Use
Trapping liquid between the filter and housing makes the adapter impossible to pull off since it is held on by hydraulics -- liquid does not compress under pressure. This configuration is excellent for surfers as water is readily available and fogging is not an issue in a fluid filled space.
In the Box
Snake River Prototyping BlurFix3+ 55 Adapter for HERO3/3+/4 Housing