SportDiver Color Filters: When to Use Red vs Magenta
By SeaLife Cameras | Published: 2026-10-16
Category: How-to Guides
Pick the right SportDiver color filter by reading water color and depth. Here is how to choose red or magenta, fit it, and know when a light beats a filter.
Quick answer
Use the red SportDiver color filter in blue water, and the magenta filter in green water. Both work best from about 10ft/3m to 60ft/18m when you are not using an external light. If you shoot with a light, the magenta filter can stay on, but the red filter is best left off so the light's color stays clean.
Read the water before you choose a filter
Color correction starts with what the water is doing to your light. In most blue-water diving, red wavelengths drop out first, so images turn blue-green. In green-water conditions, the cast leans green and yellow, and a magenta filter neutralizes it better than red. Look at the water color at depth, not at the surface, and check how your phone's preview looks before you commit.
Depth matters just as much. Both SportDiver filters are listed as most effective from 10ft/3m to 60ft/18m. Above that range there is enough ambient red that a filter can overcorrect and make the scene look muddy. Below it, there is so little red left that a filter cannot fully restore color, so a light becomes the more useful tool.
Match the filter to your light setup
The red filter is designed for use when you are not using an external light. If you add a bright dive light, the filter and the light can fight each other, and skin tones or reef colors may look unnatural. The magenta filter is more flexible: it is listed as effective with or without an external light, which makes it a practical choice when you want one filter for mixed shooting.
If you shoot mostly with a light, plan your filter choice around the light, not the water. A color-friendly light like the Sea Dragon 3000F Color Boost in the Micro 3.0 Pro 3000 Color Boost Set is built to keep colors warm, so you can often leave the filter off and adjust color temperature on the light instead.
Step-by-step: choosing and using your SportDiver filter
- Check water color and depth: At your shooting depth, note whether the water reads blue or green. If it is blue and you are between 10ft/3m and 60ft/18m, plan on red. If it is green, plan on magenta. Common mistake: choosing at the surface. Water color changes with depth, so decide once you are on the site.
- Decide whether you will use a light: If you will shoot without an external light, the red filter is the blue-water match. If you will use a light, or might switch it on and off, the magenta filter is the more flexible option. Checkpoint: if your light will be on for most shots, the red filter is usually the wrong tool.
- Fit the filter and check the seal: Press the filter onto the SportDiver's optical glass port until it sits flush. The filter also acts as a protective cover, so it should not wobble or leave a gap. Common mistake: a partially seated filter. Reseat it before you enter the water.
- Review a test shot before committing: Take one photo and check the preview on your phone. If colors look muddy or overly warm, you are likely too shallow for that filter, or the light is competing with it. Adjust by removing the filter or turning off the light rather than fighting the settings.
- Store and swap with care: Keep the unused filter in a rinse bucket or padded pouch, and rinse both the filter and housing in fresh water after the dive. Salt and sand on the filter surface will soften your images. Next step: dry and store the filter on the port so it keeps protecting the glass between dives.
Filter and light options that fit this workflow
- SportDiver Color Filter: Red: The SportDiver Color Filter: Red is a removable color-correction filter for blue water, most effective at 10ft/3m to 60ft/18m when not using an external light, and it doubles as a protective cover for the SportDiver's optical glass port. It is the straightforward choice for blue-water daytime dives without a light, and it protects the port when stored on the housing.
- SportDiver Color Filter: Magenta: The SportDiver Color Filter: Magenta is a removable color-correction filter for green water, most effective at 10ft/3m to 60ft/18m with or without an external light, and it also serves as a protective cover for the SportDiver's optical glass port. It covers green-water dives and mixed light/no-light shooting, so you do not have to swap filters when you turn a light on.
- Micro 3.0 Pro 3000 Color Boost Set: The Micro 3.0 Pro 3000 Color Boost Set pairs the Micro 3.0 camera with the Sea Dragon 3000F Color Boost light, which has a wide, even beam and a Color Boost feature for adjusting color temperature underwater. When you want reliable color at depth or in low light, a color-adjustable light solves what a filter alone cannot, especially below the filter's effective depth range.
