Sky-Watcher Evostar ED APO 150mm f/8 Refractor Guidescope (OTA Only)

Sky-Watcher Evostar ED APO 150mm f/8 Refractor Guidescope (OTA Only)

Sky-Watcher Evostar ED APO 150mm f/8 Refractor Guidescope (OTA Only)

B&H # SKS11190 MFR # S11190

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Expected availability: 7-14 business days

Product Highlights

  • For Autoguiding, Imaging, Observation
  • 150mm Apochromatic Doublet Lens
  • 1200mm Focal Length, f/8 Focal Ratio
  • Extra Low-Dispersion Lens Element
  • Dual-Speed 2" Crayford Focuser
  • T-Mount Threads for Astrophotography
  • Cradle-Ring Assembly, Vixen Dovetail
  • Hard Aluminum Carrying Case
  • OTA Only; Mount and Tripod Required
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Options: Standard Focuser and Mounting

Deluxe Focuser and Mounting

Special Order

Standard Focuser and Mounting

Aperture: 150mm f/8

150mm f/8 72mm f/5.8

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Sky-Watcher Evostar overview

  • 1Description

Use the Sky-Watcher Evostar ED APO 150mm f/8 Guidescope to improve the precision of your autoguiding system, for wide-field astrophotography, or as an exceptional platform for observation sessions.

The large 150mm aperture is complemented by an extra low-dispersion (ED) element set in a doublet apochromatic lens design. These two optical features make the Evostar much more precise than standard refractors and guidecopes, producing crisp and clear high-resolution views with limited edge distortion and accurate color representation. To achieve the sharpest focus possible, Sky-Watcher utilizes a Crayford-style focuser. Unlike a conventional rack-and-pinion system, the focuser utilizes a toothless friction mechanism that smoothly moves the drawtube without the backlash that rack-and-pinion focusers suffer from. The focuser has a large 2" drawtube to accommodate full-frame imaging sensors without vignetting.

A mounting cradle-ring assembly clamps over the optical tube assembly (OTA) and lets the user adjust the orientation and position of the scope relative to the mount to optimize viewing comfort and to help with balancing, 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 mount head with a Vixen-style saddle. Protecting the optical tube and accessories during transport and storage, a hard aluminum carrying case is provided.

Uses
  • Autoguider: The optical performance improves the precision of autoguiding systems by being able to finely focus the field and resolve guide-stars better
  • Wide-field astrophotography: Using 2" or 1.25" imaging systems directly into the drawtube enables tack-sharp and highly resolved wide-field images of the night sky, galaxies, constellations, and other objects
  • Visual: Its optical performance, focal length, and mounting rings make it an ideal platform for lunar, planetary, and deep sky observation
Optical Tube Assembly
  • Large 150mm aperture is especially useful for lunar, planetary, and deep sky observations and imaging
  • 1200mm focal length helps to produce a moderate magnification potential
  • Moderate f/8 focal ratio is ideal for observations and long-exposure astrophotography
  • Apochromatic doublet lens design with an extra low-dispersion element eliminates chromatic and spherical aberrations for true color rendition without distortion across the entire field of view
  • Hard aluminum carrying case to safely store and transport the OTA and accessories
Focuser
  • Dual-speed Crayford-style
  • Crayford focusers use a toothless friction system that allows for super-fine precision focusing without backlash
  • Large 2" drawtube prevents vignetting when using wide-field eyepieces for viewing, or large imaging sensors for astrophotography
  • Integrated M48 T-mount threads accept camera-specific T-rings to directly connect DSLRs and imaging systems to the drawtube
Mounting
  • OTA only; mount head and tripod required for proper use
  • Cradle-ring assembly for dovetail plate allows the scope orientation to be changed based on mount configuration
  • Vixen-style dovetail plate is compatible with any alt-az or equatorial mount with a Vixen-style saddle
  • Weight: 20.5 pounds
UPC: 050234111904
In the Box
Sky-Watcher Evostar ED APO 150mm f/8 Refractor Guidescope (OTA Only)
  • Mounting Ring Assembly
  • Aluminum Carrying Case
  • Limited 2-Year Warranty
  • Table of Contents
    • 1Description

    Sky-Watcher Evostar specs

    Optical Design Apochromatic doublet refractor
    Aperture 150mm
    Focal Length 1200mm
    Focal Ratio f/8
    Eyepiece Barrel Diameter 2"
    1.25" with included adapter
    Diagonal None
    Finderscope None
    Tripod None
    Mount Type Vixen-style dovetail
    Power Source None
    Optical Tube Dimensions 50.5 x 7.1" / 128.3 x 18.0 cm
    Weight 20.5 lb / 9.3 kg

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