Variable Polarizing Filter #905
Meade® Series 4000TM Photo-Visual Color Filters For increased contrast and resolution of the Moon and planets in visual or photographic applications.
#905 Variable Polarizing Filter (31.7mm/1.25")
For glare-reduction in observing the Moon the #905 Variable Polarizer includes two Polarizer filters mounted in a specially-machined cell. The #905 permits variable settings of the light transmission between 5% and 25%, to account for varying lunar surface brightness according to the phase of the Moon and the magnification and aperture of the telescope. Accepts 31.7mm(1.25") eyepieces.
Because of the reduced focuser travel, this accessory can not be used at newtonian systems.