Evostar 100mm EDX OTA
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.
Specifications
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) 100mm
F/Ratio 7
Focal Length (mm) 700mm
Included Corrector Specifications
Optional Corrector/Reducer Specifications
Corrector Name Esprit 70EDX/Evostar 100EDX flattener
Optional Corrector/Reducer SKU S20216
Reduction (reducer only) 0.92x
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 6.44
Focal Length with reducer installed 644mm
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) 29.13" / 25.2"
Dew Shield diameter (mm) 5" (128mm)
Optical Tube weight with included accessories (pounds) 8.4 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 21 pounds
Shipping Dimensions/Weight 33" x 16" x 16"
Observational Info
Dawes Limit 1.16
Rayleigh Limit 1.4
Limiting Magnitude 12.5
Minimum Magnification 14x
Maximum Magnification 197x
Light Gather (compared to next size down) 56% (compared to Evostar 80EDX)
Intended use Visual/Imaging