Available in 1.25" & 2"
Neutral density variable polarising filters are the best solution to manually adjust the brightness of observed objects while maintaining their 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.
This filter can be screwed onto any standard 2" eyepiece (M48 x 0.75).
Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability of the central wavelength.
Fully multi-coated to minimise internal reflections, halos around stars and to assure high transmission.
Schott optical glass
2mm thick glass made of Schott monolithic optical substrate (non-glued), in ultra-thin, CNC-machined, anodized filter cell.