66 Degree Ultra Wide Angle Eyepiece: Provide impressive optics with an enormously wide 66 degree apparent field of view (AFOV); Perfect for clearly observing planets or deep sky objects and offering expansive views of moon star clusters and Milky Way
Comfortable Eye Relief & Adjustable Eyecup: Generous 14.8mm eye relief with 6mm focal length allows comfortable viewing distance during astronomical; fold-down rubber eyecup design more fit the glasses wearer that prevent stray light entering when using
Advanced 5-Element HD Optics: Precision-engineered with muti-coating optical system are characterized by highly effective coatings and high light transmission, which delivers sharper and clearer observed images with better color correction and contrast
85mm focal length and reduction factor of about 0.5x that depend on spacing; 0.5x focal reducer effectively halves the focal length of a telescope for enabling lower magnification;
Mounting threads: 1.25 inch filter thread or 28.5x0.75 mm on one sides; the opposite end of this adapter has a C-mount that is 1 inch diameter with 32 threads per inch standard for C or CS mount CCTV type cameras with telescopes;