Corvane Brisk 76 reflector, tube with GoTo mount

Specifications

Description

The Brisk 76 is a Newtonian reflector with a 76 mm parabolic primary mirror and 380 mm of focal length, which gives a focal ratio of f/5. That ratio produces a wide true field for scanning the Milky Way and large nebulae with a 25 mm eyepiece, while a 6 mm eyepiece still reaches useful magnification on the Moon and bright planets. Jupiter's cloud bands show only faint detail at this aperture, so the telescope suits broad views rather than fine planetary study.

The optical tube is a steel tube with a vented rear cover, so the mirror cools toward outdoor air within about an hour. The secondary mirror sits on a four-vane spider, which adds small diffraction spikes to bright stars. Collimation is set with three thumbscrews at the back of the mirror cell, and a simple laser collimator makes the first alignment straightforward for a beginner.

The 1.25 in rack-and-pinion focuser holds standard eyepieces, and the 6x30 finder with a spring-loaded bracket mounts on the tube. The focuser travel is long enough to reach focus with a 2x Barlow lens. At 2.1 kg, the tube fits a basic alt-az tripod or a small tabletop base without strain. Lock the focus knob before you move the telescope, because the rack gear can shift under a heavy eyepiece.

Under dark skies, typical targets include the Moon, Jupiter with its four largest moons, the Orion Nebula, and the Pleiades, which fill most of a 25 mm eyepiece field. Galaxies such as the Andromeda Galaxy appear as faint, elongated glows, and you will need averted vision to pick out their brighter cores.

About this configuration

This listing covers one specific configuration of the Corvane Brisk 76 reflector, defined by its bundle, finish, accessory kit, and edition year. The GoTo mount finds objects from its database after a short alignment on two or three bright stars. The GoTo mount needs a 12 V power source, so plan for a power pack when you observe away from a mains outlet. The carbon fiber tube expands less as the temperature drops, so the focus point drifts less as the night cools.

The planetary kit adds a short focal length eyepiece and a set of color filters for the Moon and the bright planets. The 2025 edition keeps the same optical figures as the earlier years of the Brisk line. The optical figures in the specifications table apply to this configuration and to every other version of the Corvane Brisk 76 reflector.

What's in the box

• Optical tube with dust cap
• Four-vane spider and secondary mirror assembly
• 1.25 in 25 mm eyepiece
• 6x30 finder scope with bracket
• Laser collimator
• GoTo mount with steel tripod
• Hand controller and 12 V power cable
• 6 mm planetary eyepiece (1.25 in)
• Four color filters (1.25 in)

Compatibility notes

• Accepts 1.25 in eyepieces and filters directly in the focuser.
• The focuser travel supports a 2x Barlow lens for higher magnification.
• The tube mounts on basic alt-az mounts and small tabletop bases through a standard tripod-thread base.