saxon 1.25" Colour Planetary Filter No. 25A (1.25 inch)

The #25A Red Filter strongly blocks blue and green wavelengths, resulting in very sharply defined contrast between the blue-tinted cloud formations and the lighter-toned surface features on Jupiter. This filter is also quite useful for definition of the Martian polar ice caps and Maria. However, because of the reduced light transmission, the #25A can only be used on larger telescopes with over 8" of aperture. Try this one on Venus. Not only does it reduce the light glare, it really does some interesting things to the clouded Venusian atmosphere. Like the light red, this filter enables observations of Mercury at twilight when the planet is near the horizon, and of Venus during daylight, reducing brightness of the blue sky to enhance surface features of the planets.