BRESSER 8" f/3.9 Reflector Telescope - OTA Only

BRESSER 8" f/3.9 Reflector Telescope - OTA Only

BRESSER 8" f/3.9 Reflector Telescope - OTA Only

B&H # BRN20839 MFR # BR-N20839
BRESSER 8" f/3.9 Reflector Telescope - OTA Only

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Product Highlights

  • 8" Aperture Newtonian Reflector
  • 812mm Focal Length, f/3.9 Focal Ratio
  • 2" Crayford Focuser
  • 1.25" Eyepiece/Accessory Adapter
  • Comma Corrector
  • Cradle Ring Mount with Handle
  • Vixen-Style Dovetail Mounting Plate
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Options: No Mount - OTA Only

Exos-2 GoTo Mount, Tripod

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No Mount - OTA Only
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  • 1Description

Designed for enhanced astrophotography and imaging performance, the Bresser 8" f/3.9 Reflector Telescope has a shortened focal length versus conventional scopes with a similar aperture to produce a fast f/3.9 focal ratio - translating to shorter exposure times. The optical tube assembly (OTA) is offered here without a mount or tripod for users that already have an observational platform. To ensure crisp images, the scope is outfitted with the 'Clik-Fix' secondary mirror mechanism that allows users to make fine adjustments to the mirror position to perfectly collimate it with the primary mirror without the need for tools, and a coma corrector to eliminate halos that can appear around brighter images and allows users to easily split binary stars. Its large 8" primary mirror allows planets and the Moon to appear bright and clear while having the capacity to see out of the solar system to observe and image nebulae, galaxies, and binary stars.

While there is no mount included, a mounting cradle-ring assembly is provided. It clamps over the optical tube and lets the user adjust the orientation and position of the scope relative to the mount to optimize viewing comfort and balancing, while avoiding interference with other equipment. A stainless steel Vixen-style dovetail plate makes it compatible with any alt-az or equatorial mount with a Vixen-style saddle.

The scope is equipped with a 2" focuser for over-sized eyepieces and accessories, and comes with a 1.25" reducer adapter to use smaller and more popular eyepieces. The focuser is a Crayford-style, instead of the more common rack-and-pinion, which uses a steel rod held tightly against the drawtube to provide a toothless friction system that eliminates backlash and enables ultra-fine precision focusing with its 10:1 reduction micro-focusing knob.

Optical Performance
  • Aperture: 8"
  • Focal ratio: f/3.9
  • Focal length: 812mm
  • Reflector-style optical design
  • 0.6 arc second resolution
  • Click-Fix collimation/alignment system on the secondary mirror allows for fast and easy adjustment
  • Includes a coma corrector to reduce halos around bright objects and to easily split binary stars
Mounting
  • Requires user-supplied mount and tripod
  • Vixen-style dovetail mounting plate
  • Integrated 1/4"-20 piggyback camera mounting screw
  • Mounting ring cradle enables OTA orientation adjustment relative to mount
  • Carrying handle for safe set-up and break-down
Focuser
  • Dual-speed Crayford-style
  • 2" diameter drawtube
  • Coarse-focus knob, 10:1 fine-focus knob
  • Crayford focusers use a toothless friction system that allows for super-fine precision focusing without backlash
  • 1.25" adapter to use smaller eyepieces and accessories
In the Box
BRESSER 8" f/3.9 Reflector Telescope - OTA Only
  • HR Coma Corrector (2")
  • 2"-to-1.25" Eyepiece Adapter
  • Limited Three-Year Warranty
  • Table of Contents
    • 1Description
    Optical Design Newtonian reflector
    Aperture 8.2" / 20.8 cm
    Focal Length 812 mm
    Focal Ratio f/3.9
    Eyepiece Barrel Diameter 2", directly into focuser
    1.25" with included adapter
    Diagonal None
    Finderscope None
    Tripod None
    Mount Type Vixen-style dovetail plate
    Power Source N/A
    Optical Tube Dimensions Diameter: 9.3" / 23.5 cm
    Length: 27.6" / 70.0 cm
    Weight 19.8 lb / 9.0 kg

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