Meade 12mm Illuminated Astrometric Features:
Four types of measuring scales are included, for measuring double star angular separations, position angles, planetary diameters, and lunar crater diameters, as well as many other useful astronomical measurements.
Included also is a double-cross-line scale for long-exposure photo-guiding, making the Meade Astrometric Eyepiece truly an all-purpose illuminated reticle system.
The 3-element Modified Achromatic optical system yields sharp images across the full field of view; optics are coated for increased light transmission.
The eyepiece's diopter adjustment allows for sharp focusing of the reticle to the observer's eye, and a rubber eyecup (foldable for eyeglass wearers) shields distracting stray light from the observer's eye.