Condition: Dust is present in the lens, but it was not particularly noticeable during nighttime observation. Other conditions are good, but please purchase only if you understand this. Specifications: Objective lens (main mirror) effective diameter: 80mm / Achromat, multi-coated Focal length (aperture ratio F): 910mm (F11.4) Resolution and limiting magnitude: 1.45 arcseconds, 11.3 magnitude Light-gathering power: 131 times that of the naked eye Size and weight: Length 860mm, outer diameter 90mm, 3.3kg (body 2.5kg) Finder scope: 6x30mm, actual field of view 7 degrees Accessories: 2 eyepieces Erecting prism 31.7mm