Core selling point one: Adopting a three piece APO apochromatic objective lens structure, significantly improving the image quality of captured images (measured by a spectrometer to increase by 15.8% percentage points) Core selling point 2: Adopting a 2.5inch magnesium alloy dual speed toothed focusing seat, reducing vignetting when connected to a full frame camera and reducing the weight of the support platform load Core selling point three: extinction, multiple light barriers extinction inside the focusing seat and inner wall of the lens barrel   Objective aperture 80mm Focal length 480mm Jiao ratio F/6 Objective type APO three piece air separation apochromatic lens Extreme magnitude 11.6 Coating Ultra Wideband Coating (SMC) Concentrating power 130x Lens smoothness 60/40 Resolution of 1.5 arcseconds Mirror tube material: Aluminum alloy tube Extinguishing light barrier Multi channel light barrier extinction Focusing seat size 2.5 inches Focusing seat type dual speed, toothed diecasting Focusing seat material aluminum profile Focusing seat reduction ratio 1:10 2inch adapter ring for focusing seat attachment Tube size 377.8mm Net weight 3750g Lens surface type 1/8 wavelength Steyr rate 0.92 Glass material: one piece of ED glass (S-FPL51 grade)/two pieces of lanthanide glass The length of the dovetail board is 150-175mm Type of dovetail board: Vshaped 75 degree dovetail board (hollow type) CNC metal clamp with metal handwheel Type/quantity of failed clamps M6/3pcs Retractable metal light shield Focusing seat material magnesium alloy Focusing device with a loadbearing capacity of 5kg Standard configuration list Tube x1 180mm dovetail board x1 Metal clamp x1 2inch dust cover x1