This red filter is ideal for strong contrast improvement since it absorbs green and blue completely and enhances red. Clouds are dramatically improved almost to the mood of a thunderstorm. It is more effective in cutting through haze, and moonlight effects are easily accomplished. It is also suited for infrared photography. Multicoated to minimize reflection at the filter surfaces which reduces flare and ghosting.
Filter factor is 8 (+3 stops)
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This can be used to give a little more edge and definition when shooting a cloudy sky: The clouds become a bit more somber, and look great after b&w conversion
I'm using this with a full-spectrum converted body for IR work and it's wonderful what it does for soft red and blue tones, especially when playing with the color-channel swap. This is a good addition for anyone with a full compliment of IR filters in a full spectrum rig.