EvoStar 100mm f/9 Doublet APO Refractor (OTA only) Product Image

EvoStar 100mm f/9 Doublet APO Refractor (OTA only)

Product Description

The EvoStar 100mm f/9 Doublet APO Refractor from Sky-Watcher features a doublet apochromatic lens system with Extra-low Dispersion (ED) glass and Sky-Watcher's proprietary photon anti-rejection Metallic High-Transmission Coatings (MHC) on all air-to-glass optical surfaces. This combination of glass, lenses, and coatings virtually eliminates chromatic aberrations for clear and bright high-contrast images with true color rendition. This is a versatile optical tube assembly (OTA) that is well suited for wide-field astronomical observation of prominent nebulae, star clusters and galaxies, or can be used as an astrograph for sky photography, a terrestrial spotting scope or telephoto lens. The aperture of this 100mm model of the ProED not only increases image brightness over the smaller 80mm version, it improves resolution and contrast.

A mounting cradle-ring clamps over OTA and allows the user to adjust the orientation and position of the scope relative to the mount to optimize viewing comfort and balance, while avoiding interference with other equipment. The scope is offered without a mount or tripod, but a Vixen-style dovetail plate makes it compatible with any alt-az or equatorial mount with a Vixen-style saddle.

Its two-speed Crayford-style focuser helps make fine-focusing fast and precise without backlash. The EvoStar comes with several accessories to help you get observing faster and easier. First, are two long eye relief eyepieces that produce 30 and 120x magnification, a 90° star diagonal for more comfortable viewing, and a large 8x50 erect-image finderscope to make finding your celestial objects faster and easier. Finally, Sky-Watcher provides a foam-lined aluminum carrying case to safely store and transport the OTA.

Optical Tube Assembly
Optical Design
Optical Design
Optical Design Apochromatic Refractor
Aperture 100 mm / 3.9"
Focal Length 900 mm
Focal Ratio f/9
Focuser Dual-Speed Crayford
Eyepiece Barrel Diameter 2"
Diagonal 90� Star
Finderscope Yes
Mounting Vixen Style
Optical Tube Dimensions Length: 34" / 86.4 cm
Filtration Wavelength
Blocking Filter
Thermal Stability
GoTo Capability
Payload Capacity
Altitude Adjustment
Latitude Adjustment
Tripod Height Adjustment Range
Material of Tripod
Batteries None
Wi-Fi No
Assembled Dimensions
Weight 8.4 lb / 3.8 kg