Vixen A80Mf AC 80/910 OTA

Description

Resolve fine details along lunar rilles and split bright double stars using the Vixen A80Mf AC 80/910 OTA long-focus achromatic doublet refractor optical tube assembly. Operating at an f/11.4 focal ratio with a 910mm focal length, this 80mm (3.15 in) clear aperture telescope delivers a 1.45 arcseconds theoretical resolving power and reaches magnitude 11.3, gathering light for high-contrast lunar observing, planetary tracking, and long-distance terrestrial telephoto spotting.

The optical system features an air-spaced Fraunhofer doublet objective fabricated from precision annealed Japanese crown and flint optical glass, treated with multi-coated anti-reflection layers with an unobstructed 0% central profile. Built inside an aluminum chassis measuring 860mm in length with a 90mm outer tube diameter, the tube assembly provides a 44mm full-frame visual and photographic image circle. Supported by a 1.25-inch single-speed rack-and-pinion focuser with an integrated external T-2 camera thread, this 3.30 kg (7.28 lbs) optical tube attaches directly to mount saddles via an included standard 44mm Vixen-style dovetail bar and tube rings.

Key Features of Vixen A80Mf AC 80/910 OTA

Designed as a versatile optical tube assembly for existing mount platforms, this 80mm refractor combines an f/11.4 optical train with an integrated T-2 camera connection. Tube mounting rings, a standard Vixen dovetail bar, two Plössl NPL eyepieces, an erect-image prism diagonal, and an optical finderscope provide an adaptable observing setup.

• 80mm (3.15 in) clear aperture with 910mm focal length and high-contrast f/11.4 optical speed
• Air-spaced Fraunhofer achromatic doublet made from precision annealed Japanese optical glass
• Multi-coated optical surfaces delivering high light transmission with 0% central obstruction
• 1.25-inch rack-and-pinion focuser with integrated external T-2 thread for direct camera coupling
• Corrected 44mm full-frame image circle covering visual eyepieces and camera sensors
• CNC tube mounting rings with standard 44mm Vixen-style dovetail mounting bar
• Optical 6×30 finderscope and 1.25-inch 90-degree erect-image diagonal prism included
• Supplied with Plössl NPL 20mm and NPL 6.3mm eyepieces for low and high magnification

Japanese Annealed Crown-Flint Doublet Optics

The long f/11.4 optical train controls secondary spectrum chromatic aberration across visible wavelengths, delivering crisp contrast along lunar crater rims and planetary disks. Annealed Japanese crown and flint optical glasses preserve optical wavefront accuracy during ambient nocturnal temperature drops, supporting practical visual magnifications from 11.4x up to 160x.

Direct T-2 Threaded Coupling & Erect-Image Diagnostics

Visual and photographic utility is integrated into the drawtube via an external T-2 thread that accepts standard camera T-rings without auxiliary adapters. The included 90-degree erect-image prism ensures correctly oriented views for daytime spotting and lunar exploration, while the 3.30 kg optical tube assembly balances smoothly on standard Vixen saddle clamps.

• Integrated T-2 external camera thread on the drawtube for direct telephoto imaging attachment
• Included 90-degree erect-image diagonal prism providing correct orientation for land and sky viewing
• Solid aluminum tube construction with 44mm Vixen dovetail bar for broad mount compatibility

Vixen Achromatic Doublet Series Five-Year Warranty

The Vixen A80Mf AC 80/910 OTA is backed by a 5-year limited warranty against material and manufacturing defects. The complete factory package contains the A80Mf optical tube assembly, tube mounting rings, Vixen dovetail bar, 6×30 optical finderscope, 1.25-inch 90-degree erect-image diagonal prism, and Plössl NPL 20mm and NPL 6.3mm eyepieces.