High Quality polished surfaces 1.25 inch variable polarizing filter from 5% to 35% transmission.

The ProStar, 1.25 inch Variable Polarizing Filter, is the all-phase lunar filter for large telescopes.

Transmittance is continuously variable from 5% to 35%. Fits 1.25-inch eyepieces.

ProStar Polarising Filters are made from Hoya optical glass allowing for maximum contrast of lunar detail. Individually precision ground, highly polished with maximum light transmission coatings on both sides.