OPTOLONG POLARIZING MOON FILTER Size:1.25" Short locking ring with knurled

Short locking ring with knurled outer part and internal M42 female thread

Optical flatness 1/4 λ (wavefront)

when you approximate UT1 with UTC

PL3304807 + PL3304807 + PL3304801 + PL3304800 16 7mm M48 extension + 9mm M48 extension PL3304807 + PL3304809 16

OPTOLONG POLARIZING MOON FILTER Size:1.25" Short locking ring with knurledNeutral density variable polarising filters are the best solution to manually adjust the brightness of the observed object maintaining its original colour. This filter is an assembly of two separate glasses that can be rotated to adjust the light transmission between 1% and 40%. This is particularly useful to reduce the glare and the brightness of the Moon, especially at low magnification when the Moon appears too bright. The filters are glass filters