Sky-Watcher Evostar EDX refractors provide the finest images obtainable in their design class. These doublet refractors deliver dramatic, coal-black skies and faithful, contrast-rich views of planetary and deep-space phenomenon that are second to none. Sky-Watcher Evostar EDX refractors are the logical choice for the discriminating amateur astronomer looking for an investment in advanced instrumentation for exceptional viewing and astrophotography. Optical Specifications Optical Design (achro or apo) Apochromatic Lens Coating (fully multi-coated)? Fully multi-coated Lens design (doublet, triplet or Quad) ED Doublet (Air Spaced) ED Glass FPL-53 Optical Quality Diffraction limited (1/4 wave) Collimatable Cell No (Self Aligning Cell) Primary Aperture (mm) 80mm F/Ratio 7.5 Focal Length (mm) 600mm Included Corrector Specifications Optional Corrector/Reducer Specifications Corrector Name Evostar 80ED 0.85x reducer/flattener Optional Corrector/Reducer SKU S20200 Reduction (reducer only) 0.85x Corrector - insertable or thread-on Thread on Corrector Thread size M56x1 female/48mm male Corrector Back Focus 55mm Corrector illuminated field 43mm F/Ratio with reducer installed 6.375 Focal Length with reducer installed 510mm Corrector adapter needed? Included with telescope Corrector allow for 2" filters? No* (Adapter needed) Mechanical Specifications Focuser Type Crayford Focuser Size 2.8" Focuser: Dual or Single Speed Dual speed (11:1 ratio) Focuser: Rotatable? No Camera Angle Adjuster? Yes Compression Ring Yes Retractable dew shield? No* (Removeable (thread-on)) OTA material Aluminum Optical Tube length Retracted/Extended (inches) 22" / 18.7" Dew Shield diameter (mm) 4.84" (123mm) Optical Tube weight with included accessories (pounds) 7.3 pounds Mounting Rings? Yes Dovetail type V-style Dovetail length 8" Mounting ring threads (upper holes) 1/4-20 Accessories Eyepieces No Diagonal No Mounting Hardware Mounting Rings/Dovetail Camera Adapter No Flatter or Corrector No Additonal Accessories No Collimation eyepiece None Included finder No Manual Yes Case Yes Shipping Weight 19.5 pounds Shipping Dimensions/Weight 29.25" x 15" x 12" Observational Info Dawes Limit 1.45 Rayleigh Limit 1.75 Limiting Magnitude 12 Minimum Magnification 11x Maximum Magnification 157x Light Gather (compared to next size down) 24% (compared to 72ED) Intended use Visual/Imaging
