Keldan Spectrum Filter SF -2, 67mm

The Spectrum Filter SF -2 is designed to compensate for the light absorption for all water colors and therefore provides a smooth, well balanced light spectrum to the sensor of your camera. This greatly improves the color rendering of your images and adjust the color coordinates close to daylight for outstanding results with manual white balance.

The Spectrum Filter SF -2 has a compensation depth of 4m. At this depth the filter makes a perfect compensation of the light absorbtion of the water column. The camera then sees a daylight spectrum just like shooting at the surface. The filter is designed to provide optimal performance for any water color from blue to green water. It works best within a depth range of 2 to 15 meters. The filter has a damping equivalent to a loss of 1.5 stops.

For deeper depth we recommend to use either SF -4 B (for blue water) or SF -4 G (for green water)

KELDAN Spectrum Filters are scientifically engineered red filters based on spectral measurements of the lighting conditions underwater. This filter convert the ambient light into a daylight spectrum in order to restore correct colors and to optimize white balancing. The filter characteristics are carefully adjusted not only to balance the RGB color channels but also to correct for a very smooth spectrum with excellent color rendering capabilities.

Without spectrum filter (left image): Due to the light absorption of the water column many colors are missing and the camera can no more recover all color after white balance. With spectrum filter (right image): the filter compensates the light absorption of the water column and the camera can restore all colors after white balance.