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Meade #905 Variable Polarizing Filter (1.25") System 07286 includes 2 Polarizer filters mounted in a specially-machined cell, for glare-reduction in observing the Moon. Meade # 905 Polarizer System 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 .