Meade Red Colour Filter #25a by Meade
Meade Red Colour Filter #25a
The #25A filter strongly blocks the transmission of blue and blue-green wavelengths, resulting in very sharply defined contrast between – for example – blue-tinted cloud formations on Jupiter and the lighter-toned features of the disc. Also useful for the delineation of the Martian polar ice caps and maria. Because of its relatively low total light transmission the #25A filter should be employed on telescopes of 8" aperture and larger.