The LF2115, 2" Variable Polarizing Filter, is the all-phase lunar filter for large telescopes. Transmittance is continuously variable from about 5% to 35%. Fits 2" eyepieces. Lumicon Polarizing Filters are made from renowned Schott- Hoya optical glass and allow for maximum contrast of lunar detail. Individually precision ground, highly polished with maximum light transmission coatings on both sides, these filters are 100% guaranteed for life.