The Olivon Deep Red #25 filter allows only the far end of the red spectrum to pass through, dramatically increasing contrast for planetary and lunar observation under bright skies. This deeper cut of red light offers enhanced surface detail, especially on Mars.
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Colour: Deep Red (#25)
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Size: 1.25″ threaded filter
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Purpose: Blocks out most blue and green light to sharpen contrast on planetary surfaces
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Best For:
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Revealing Martian surface features such as maria and polar caps
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Increasing lunar surface detail in daylight or bright twilight
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Observing Mercury and Venus during daylight
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Effects: Significantly darkens the sky background, especially useful for daytime or urban viewing
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Compatibility: Standard 1.25″ eyepiece threads
Its intensity makes it less ideal for small telescopes, but with 6″ apertures or larger, it truly shines—especially on Mars.
