Eyepiece filters are an invaluable aid in lunar and planetary observing.
They reduce glare and light scattering, increase contrast through selective filtration, increase definition and resolution, reduce irradiation and lessen eye fatigue.
These filters are made of high quality, solid plane parallel glass with excellent homogeneity.
They are anti-reflection coated to prevent glaring and ghosting.
All eyepiece filters are threaded to fit most 1.25″ eyepieces and offer a full 26mm clear aperture. Comes with a hinged, plastic case to keep your filter safe and clean when not in use.
#23A Light Red (25% transmission): On telescopes of 6″ aperture and larger the #23A does approximately the same functions as the #21 filter, but with stronger contrast and enhancement of marginally defined blue-green surface detail. Useful primarily on Jupiter, Saturn, and Mars. Increases contrast between Mercury and bright blue sky during daylight observations or during twilight.
The Orion 1.25 inch 13 percent Transmission Moon Filter reduces glare so you can see more lunar detail and surface features with your telescope
Metal filter cell threads directly into the 1.25 inch barrel of your telescope eyepiece
Especially useful for large aperture telescopes through which the light of the Moon can be extremely overwhelming
Telescope eyepiece filter transmits only 13 percent of the incoming light, boosting contrast and ability to discern detail on the Moon
Perfectly neutral color will not alter the natural color of the Moon
The Moon’s disk, even at partial phases, is intensely bright with reflected sunlight. The glare washes out most of the craters, rilles, and other surface details from view. Our 1.25″ Orion 13% Transmission Moon Filter reduces the glare, allowing transmission of only 13% of the reflected light. Not only will you see more surface features, but you can study them in greater comfort. The filter reduces irradiation, which is the distortion at the boundary between light and dark areas, such as along the lunar terminator. The Orion Moon Filter is especially useful to owners of large-aperture scopes, in which the Moon’s brightness can be overwhelming. It uniformly reduces light over the entire visible spectrum. Filter screws into threaded eyepiece barrel for secure attachment.