Vixen AP-A81M AC 81/910 Telescope

Description

Track the cloud bands of Jupiter and lunar mountain shadows through the Vixen AP-A81M AC 81/910 Telescope manual equatorial refractor telescope system. Operating at an f/11.2 focal ratio with a 910mm focal length, this 81mm (3.19 in) clear aperture instrument delivers a 1.43 arcseconds theoretical resolving power and reaches magnitude 11.3, gathering light for high-precision planetary tracking, lunar surface observation, and double-star splitting.

The optical system features an air-spaced long-focus Fraunhofer doublet objective fabricated from Japanese precision annealed crown and flint optical glass, treated with fully multi-coated (FMC) broad-band anti-reflection optics and an unobstructed 0% central profile. Built inside an aluminum chassis measuring 890mm in length with a 90mm outer tube diameter, the tube assembly supplies 145mm of back focus from the rear visual back without a diagonal. Supported by a 2-inch rack-and-pinion focuser with tension adjustment and a direct SLR T-thread interface, this 3.50 kg (7.72 lbs) optical tube mounts to an included Advanced Polaris manual German equatorial mount with slip-clutch slow-motion controls and an APP-TL130 tripod for a total system weight of approximately 11.2 kg.

Key Features of Vixen AP-A81M AC 81/910 Telescope

Engineered for visual observers demanding precise manual celestial tracking, this 81mm refractor pairs Japanese optical glass with Vixen’s modular Advanced Polaris equatorial mount. Its friction slip-clutch mechanism, APP-TL130 compact tripod, two Plössl NPL eyepieces, and dual-port flip mirror diagonal provide a stable, modular platform for planetary astronomy.

• 81mm (3.19 in) clear aperture with 910mm focal length and high-contrast f/11.2 focal ratio
• Air-spaced Fraunhofer doublet made from Japanese precision annealed crown and flint glass
• Fully multi-coated broad-band anti-reflection optics with 0% central obstruction
• 2-inch rack-and-pinion focuser with tension adjustment and integrated SLR T-thread coupling
• Modular Advanced Polaris (AP) manual German equatorial mount with slow-motion controls
• Friction slip-clutch mechanism allowing manual pointing without loosening axis clamp levers
• Compact APP-TL130 aluminum tripod with accessory tray offering rigid observing stability
• Red dot finder, dual-port flip mirror diagonal, and Plössl NPL 20mm and 6.3mm eyepieces included

Fully Multi-Coated 81mm Optics & Wavefront Purity

The long f/11.2 optical train controls chromatic aberration across the visible spectrum, delivering high optical contrast on subtle lunar rilles and planetary details. Precision annealed Japanese optical glasses preserve thermal figure stability as ambient temperatures fall, supporting practical visual magnifications from 11.6x up to 162x.

Advanced Polaris Modular Equatorial Mount & Slip Clutches

Equatorial tracking along right ascension and declination is delivered through the modular Advanced Polaris mount, featuring internal worm gears and slow-motion control knobs. Its friction slip-clutch mechanism allows observers to push the telescope directly toward a target by hand without releasing locking levers, while the modular chassis supports motor drive upgrades.

• Advanced Polaris equatorial mount with slip-clutch system for immediate manual target acquisition
• Dual-axis slow-motion control knobs allowing precise manual centering of celestial objects
• Modular mount chassis engineered to accept optional motor drive upgrades and polar finders

Vixen AP Equatorial System Five-Year Limited Warranty

The Vixen AP-A81M AC 81/910 Telescope is backed by a 5-year limited warranty against material and manufacturing defects. The complete factory package contains the A81M refractor OTA, AP equatorial mount head, APP-TL130 compact tripod with tray, 1.0 kg counterweight, red dot finder, dual-port flip mirror diagonal, and Plössl NPL 20mm and NPL 6.3mm eyepieces.