Premium Moon Neutral Density Filter 1.25" (25% light reduction)

The premium #ND96 neutral density moon filter is a standard accessory for lunar observing, which blocks 25% of the light passing through it. It is a high quality unit with plane polished glass surfaces, and a very even transmission of light. It should not be confused with cheaper filters.

 

The machining is very precise and the filter is held nicely orthogonal to it's housing, which is threaded to fit standard 1.25" eyepieces, Barlow lenses and 1.25" diagonal mirror barrels. Most astronomical accessories have this thread on the base, including webcam adapters. 

 

Why use a moon filter? Telescopes (even the smallest ones) gather so much light, that the moon is sometimes just too bright for comfortable observing. Fine details like lunar seas get washed out in the glare. This premium quality filter removes excess glare from lunar images, bringing out finer detail. It's threaded to fit into the base of standard 1.25" barrel astronomy eyepieces. (M28x0.5 thread).