Sky Watcher Evoguide 50DX APO Guide Scope Astrograph White/Black. These doublet refractors deliver dramatic coal-black skies and faithful contrast-rich views of planetary and deep-space phenomenon that are second to none. Mounting to your guide camera is a breeze with convenient M42 rings on the back of the scope and a beefy single-speed focus ring helps you nail focus. Although initially designed for guide cameras the EvoGuide 50DX APO Guide Scope Astrograph can be used to shoot fast low focal length astrophotography when used in conjunction with a focal reducer (not included) producing stunning wide-field images. Specifications for Sky Watcher Evoguide 50DX APO Guide Scope Astrograph: Manufacturer: Sky Watcher Color: White/Black Objective Lens Diameter: 50 mm Focal Length: 242 mm Lens Material: ED Glass Features of Sky Watcher Evoguide 50DX APO Guide Scope Astrograph 50mm Apochromatic refractor with matched lens assembly with one ED element 242 mm focal length (f/4.8) 1.25 Helical focuser Finder stalk Vixen-style mounting plate Prime focus wheel Package Contents: Sky Watcher Evoguide 50DX APO Guide Scope Astrograph EvoGuide 50 optical tube Tube rings Finder stalk Vixen-style mounting plate Sky Watcher S11174: Evoguide 50DX APO Guide Scope Astrograph White/Black