85mm focal length, reduction factor of about 0.5X; depending on spacing; 0.5x focal reducer effectively halves the focal length of a telescope; enabling lower magnification; a wider field of view; and shorter exposure times for astrophotography
1.25inch 45-degree mirror star diagonal for refractor telescopes with 1.25inch connector "not recommended for reflectors"; protective coating on the mirror to ensure a long life; metal barrel - for secure seating in the focuser
This is a great diagonal for daytime terrestrial use and night time astronomy applications for telescopes or spotting scopes
Wide 66-deg apparent field offers expansive views of the moon; star clusters; and the Milky Way; generous 14.8mm eye relief allows comfortable viewing distance and lets eyeglass wearers see the entire field of view
5-element design deliver sharp image with good color correction and contrast; offers a wide field of view and superior performance; aluminum 1.25 inch eyepiece barrel is internally blackened to eliminate light scattering; thread to accept 1.25 inch filter