Vixen ED80Sf AP 80/600 Porta-II Telescope

Description

Designed for grab-and-go backyard observing and high-contrast lunar scanning, the Vixen ED80Sf AP 80/600 Porta-II Telescope is a complete manual alt-azimuth apochromatic refractor telescope package. Operating at an f/7.5 focal ratio with a 600mm focal length, this 80mm (3.15 in) clear aperture instrument delivers a 1.45 arcseconds theoretical resolving power and reaches magnitude 11.3, gathering light for high-contrast planetary viewing, double-star resolution, and terrestrial nature observation.

The optical system features an air-spaced extra-low dispersion doublet objective pairing an Ohara FPL-53 element with high-index crown glass, treated with multi-coated anti-reflection layers and an unobstructed 0% central profile. Measuring 570mm in length with a 100mm outer tube diameter, the tube assembly supplies 135mm of back focus from the rear 2-inch drawtube. Supported by a 2-inch Crayford focuser with tension control and an integrated T-thread interface, this 3.40 kg (7.50 lbs) optical tube attaches to an included Porta II manual alt-azimuth mount featuring a friction clutch system, dual 360-degree slow-motion worm gears, and an aluminum tripod for a total system weight of approximately 9.1 kg.

Key Features of Vixen ED80Sf AP 80/600 Porta-II Telescope

Built for observers seeking true apochromatic performance on an intuitive alt-azimuth mount, this 80mm refractor pairs an Ohara FPL-53 doublet with Vixen’s Porta II mount head. Two Plössl NPL eyepieces, a dual-port flip mirror diagonal, slow-motion control handles, an optical 9×50 finderscope, and an aluminum flight case provide a complete observational system.

• 80mm (3.15 in) clear aperture with 600mm focal length and versatile f/7.5 optical speed
• Air-spaced ED doublet objective utilizing Ohara FPL-53 and high-index crown glass
• Multi-coated anti-reflection optical layers with an unobstructed 0% central profile
• 2-inch Crayford focuser with tension adjustment and integrated external T-thread coupling
• Porta II manual alt-azimuth mount with friction clutch system and two-section aluminum tripod
• Dual slow-motion worm gears providing continuous 360-degree tracking in altitude and azimuth
• Optical 9×50 finderscope and dual-port flip mirror diagonal for instant accessory switching
• Supplied with Plössl NPL 20mm and NPL 6.3mm eyepieces and an aluminum flight case

High-Contrast Apochromatic Objective & Optical Transmission

The combination of Ohara FPL-53 glass and high-index crown elements eliminates chromatic aberration across the field of view, delivering razor-sharp views of Jupiter’s cloud belts and lunar craters. The unobstructed optical train preserves high transmission, supporting practical visual magnifications from 11.4x up to 160x.

Porta II Friction Clutch & 360-Degree Worm Gear Tracking

Navigating the night sky or terrestrial targets is managed through the Porta II alt-azimuth mount, featuring full-circle worm gears that eliminate axis locking clamps. Observers can aim the telescope by hand and engage the slow-motion control handles for fine centering, while the aluminum flight case ensures secure storage and transport for the optical tube assembly.

• Porta II alt-azimuth mount with friction clutch system for immediate manual target acquisition
• Continuous 360-degree slow-motion worm gear drives on both altitude and azimuth axes
• Custom aluminum flight case providing rigid structural protection for the optical tube assembly

Porta II Complete System Five-Year Limited Warranty

The Vixen ED80Sf AP 80/600 Porta-II Telescope is backed by a 5-year limited warranty against material and manufacturing defects. The complete factory package contains the ED80Sf refractor OTA, Porta II alt-az mount head, aluminum tripod with tray, dual slow-motion handles, 9×50 optical finderscope, dual-port flip mirror diagonal, Plössl NPL 20mm and NPL 6.3mm eyepieces, and an aluminum flight case.