Sky-Watcher Evostar 80EDX Super APO Triplet - S11135

Doublet apochromatic optical design Two-element, air-spaced optical assembly minimizes false color 80mm aperture, 600mm focal length, f/7.5 focal ratio FPL 53 glass 2.8-inch dual-speed Crayford-style focuser Thread-on dew shield Aluminum tube coated with glossy, white metal-flake finish Included accessories: Tube rings, 2.8-inch Crayford-style focuser, camera angle adjuster, thread-on dew shield, focuser adapter ring, spacer, 1.25 to 2-inch adapter, and a V-style dovetail An Elegant Balance of Value and Performance Sky-Watcher’s Evostar apochromatic doublet refractors are the perfect blend of superior extra-low dispersion glass and affordability. The Evostar refractor lens assembly utilizes a proprietary combination of matched lenses, delivering tack-sharp stars with charcoal-black, contrast-rich skies. All ED glass elements are fluorite-based and feature our proprietary Metallic High-Transmission Coatings™ (MHTC™), virtually eliminating all false color while internal baffle prevent stray light from affecting your photography. Like the optics, the tube is beautifully crafted using aluminum and finished with a white metal-flake finish. Using a doublet refractor instead of a triplet has some advantages: less glass means less weight, less weight means a less expensive telescope, so you can dedicate more money for your mount, camera, or accessories while benefiting from a lightweight astrophotography rig. 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. Evostars come in a foam-lined aluminum case with accessories, including: 2.8-inch Crayford-style focuser, tube rings, camera angle adjuster, thread-on dew shield, focuser adapter ring, spacer, 1.25 to 2-inch adapter, and a V-style dovetail. Razor Sharp Optics Sky-Watcher Evostar EDX refractors use the finest extra-low dispersion glass available. This results in the best color correction for an ED doublet lens. Versatility and Affordability The Evostar EDX line is designed to meet the needs of both the discerning imager and the experienced observer while keeping finances in mind. A Complete Range of Apertures Evostar EDX comes in a wide selection of apertures to fit the needs of the contemporary amateur astronomer, from the compact 80mm for your grab-and-go setup to the generous 120mm for high-resolution work, you will find what you're looking for. EvoGuide 50mm Minigraph The 50mm Evoguide is Sky-Watcher's smallest ED APO refractor, equally comfortable as a high-resolution guidescope or, when paired with its matched field flattener, as an ultra-compact astrograph. Specifications SKU S11135 UPC 810098970822 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