Optical Glass Achromatic Objective Lens Concave&Convex Lens for DIY Telescope

Model            Diameter           Focus                Focus ratio                    Film    
50mm              51mm              360mm                F7.2                               Blue
60mm              62mm              700mm                F11.6                             Blue
70mm              72mm              500mm                F7.1                               Blue
80mm              83mm              600mm                F7.5                               Green


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