Vixen Optics Advanced Polaris-M Mount with ED81S II Telescope

Vixen Optics Advanced Polaris-M Mount with ED81S II Telescope

Vixen Optics Advanced Polaris-M Mount with ED81S II Telescope

B&H # VIAPSMMED81S MFR # 39984
Vixen Optics Advanced Polaris-M Mount with ED81S II Telescope

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Product Highlights

  • 81mm SD Achromatic Refractor
  • 625mm Focal Length, f/7.7 Focal Ratio
  • German Equatorial Mount
  • Right Ascension Stepper Motor
  • Star Book One Hand Controller
  • Multiple Tracking and Slew Speeds
  • PEC and Backlash Compensation
  • 13.2-lb Payload Capacity
  • Tube Rings with Integrated Carry Handle
  • Adjustable-Height Tripod
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  • 1Description

Vixen Optics' Advanced Polaris-M Mount with ED81S II Telescope is a complete astronomy platform that is ideal for detailed observations within the solar system or for astrophotography. The scope is outfitted with an achromatic lens system using super low-dispersion (SD) glass and fully multi-coated optics that produces bright and clear high-contrast images with true color representation across its entire distortion-free field of view. Its 81mm objective gathers more light than smaller-objective models with a short focal length to reduce the focal ratio to a moderately-fast f/7.7, while still being easy to set-up and transport - especially when using the integrated handle on the rear mounting ring. The lens system, glass, and optical coatings, will give you great views of the Moon, planets, planetary moons, and brighter deep sky objects, while allowing you to split binary stars and observe bright objects with virtually no comas. For astrophotography, a flip-mirror diagonal is included so users can have an eyepiece at the 90° position and their imaging rig in the other and be able to check position and tracking simply by flipping the mirror down.

The mount's right ascension micro-stepper motor has full-circle brass wheel gear that allows the mount to track over extremely long periods with little error for long-exposure astrophotography or prolonged observation of a single celestial object. While this mount configuration does not have full Go-To capabilities, once you Polar align the mount and manually navigate to your subject, the Star Book One controller will track it across the right ascension all night. This version of the AP-M includes Vixen's TL130 adjustable-height tripod. Use the included Star Book One hand controller to move the scope for navigating and to track celestial objects. Since near and deep sky objects appear to move at different speeds, the controller features celestial, solar, lunar, and King's rate tracking speeds, in addition to slew speeds from 0.05x to 1000x. An integrated autoguider port adds to the mount's usability.

Optical Tube Assembly
  • 81mm objective
  • f/7.7 focal ratio
  • 625mm focal length
  • Refractor-style optical path
  • Achromatic lens configuration corrects spherical and chromatic aberrations to produce distortion-free high-contrast images with true color representation
  • Super low-dispersion (SD) glass further corrects chromatic aberrations
  • Fully coated optics produce bright and clear images with true color rendition
  • Resolution: 1.43 arcsec
  • 1.25" rack-and-pinion focuser
  • 42mm threaded back for mounting photo adapters
  • Motorized German equatorial
  • Payload capacity: 13.2 lb, excluding counterweights
  • Altitude:
    • 0-65° adjustment
    • Tangent screw with handle
    • 1.9°/rotation
    • 59mm diameter, aluminum alloy axis shaft with friction stop
  • Azimuth:
    • ±6.5° fine adjustment
    • Twin adjustment screws with knobs
    • 1.4°/rotation
    • 59mm diameter, aluminum alloy axis shaft with friction stop
  • 7 stainless steel ball bearings
  • 8" long, 20mm diameter counterweight shaft
  • 2.2 lb (1kg) counterweight
  • Vixen-style dovetail saddle
  • Runs on four user-supplied AA batteries
Star Book One
  • 2-line 8-character backlit display
  • Red backlit keypad
  • Independent screen and keypad dimming control
  • Integrated red LED light
    • Won't affect night-adjusted vision
    • Use to read or perform tasks
    • Adjustable brightness
  • ST-4 compatible integrated autoguider port
  • Multiple sidereal tracking speeds:
    • Celestial
    • Solar
    • Lunar
    • King's rate
  • Variable manual slewing speeds from 0.5x to 999x
  • Backlash compensation gives smoother rotation of the gears on the mount, especially when stopping or changing slew/tracking speeds
  • Periodic error correction (PEC) removes inaccuracies inherent in gears and allows for more accurate tracking, especially for long-exposure astrophotography
  • Selectable tracking for Northern or Southern hemisphere
  • Physical specification:
    • Powered by mount through connector port
    • Operating temperature: 32-104°F (0-40°C)
    • Dimensions: 5.4 x 2.5 x 1" (13.7 x 6.5 x 2.1 cm)
    • Weight: 4 oz (110g), excluding cable
OTA Accessories
  • Diagonal:
    • Dual eyepiece holders
    • Internal flip mirror directs light straight-through or up 90°
    • Use with two different eyepieces or with a photo rig
    • When using with photo rig, put eyepiece at 90° position to check tracking and make corrections
  • Eyepieces:
    • 1.25" diameter barrel is compatible with most filters
    • 20mm: produces 31x magnification
    • 5mm: produces 125x magnification
  • Red-dot finderscope
  • Mounting rings with carrying handle
  • Vixen-style dovetail plate
  • Three leg sections
  • Easy-to-use snap locks
  • Adjustable padded feet
  • Collapsed length: 24" (61cm)
  • Legs adjustable from 22.4-51" (56.9-129.5cm)
  • Total adjustable height from 20.7-45.6" (52.6-115.8cm)
  • Weight: 7 lb (3.2kg)
In the Box
Vixen Optics Advanced Polaris-M Mount with ED81S II Telescope
  • Advanced Polaris-M Motorized EQ Mount with SB One and Tripod uyzrxbeeyttrwyezdttfveawddxydtz
  • Red-Dot Finderscope
  • 90° Flip Mirror
  • 20mm Eyepiece
  • 5mm Eyepiece
  • Mounting Rings with Carry Handle
  • Limited Five-Year Warranty
  • Table of Contents
    • 1Description
    Optical Design Achromatic SD refractor
    Aperture 81 mm
    Focal Length 625 mm
    Focal Ratio f/7.7
    Eyepiece Barrel Diameter 1.25"
    Diagonal 90° flip mirror
    Finderscope Red-dot
    Tripod Adjustable height
    Mount Type German equatorial with Right Ascension motor
    Power Source 4 x AA batteries
    Motor Micro-stepper
    Load Capacity 13.2 lb / 6.0 kg
    Altitude / Latitude Adjustment Altitude: 0 - 65°
    Azimuth: ±6.5°
    Includes Tripod/Pier Adjustable height
    Polar Axis Scope None
    GO-TO Capability None
    Optical Tube Dimensions 23.0 x 3.5" / 58.5 x 9.0 cm
    Weight OTA: 5.1 lb / 2.3 kg
    Mount head: 8.5 lb / 3.9 kg, without counterweight
    Tripod: 7.0 lb / 3.2 kg
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