Outfitted with a large 81mm aperture and an apochromatic lens configuration, the Vixen Optics A81M 81mm f/11 APO Refractor Telescope is an ideal choice for making detailed observations of the Moon and planets, as well as splitting binary stars and discerning details of distant galaxies and nebulae. Crown and flint glass lens elements, combined with multi-coated optics, work together to produce high-contrast images with accurate color rendition across the entire field of view with virtually zero distortion at the edges.
This optical performance also makes the A81M an ideal choice for astrophotography. To make imaging easier, Vixen integrates a 90° flip mirror with two 1.25" eyepiece holders. For imaging, the rig is set at the back of the diagonal using an optional T-ring screwed directly onto the holder or other imaging configurations, with an eyepiece at the 90° position. In this configuration, with a simple flip of the mirror, the tracking accuracy can be checked and corrected without removing and re-mounting the delicate photo setup. This optical tube assembly (OTA) is offered here without a mount or tripod for those with a reliable setup, and comes with a cradle ring set with a Vixen-style dovetail plate and handle for safe and secure handling during setup and breakdown. Vixen Optics manufactures and assembles the A81M in Japan.
Optical Performance
- 81mm aperture
- f/11 focal ratio
- 910mm focal length
- Refractor optical path
- Apochromatic lens configuration with convex crown glass and concave flint glass; different lens designs and materials work together to reduce chromatic aberration
- Multi-coated optics and lens design produce bright and clear high-contrast images with accurate color rendition
- Resolution: 1.43 arcsec
- Sturdy and reliable rack-and-pinion focuser
- Unmagnified red-dot finder enables faster OTA positioning
Imaging
- Dual 1.25" eyepiece holders
- Internal flip mirror allows the use of two eyepieces or eyepiece/imaging combination
- Able to perform various astrophotography techniques including eyepiece projection, prime-focus, and afocal imaging
- When imaging, quickly flip mirror to check tracking between exposures without un-mounting imaging rig
- 60mm, 42mm T-threads on straight-through light path allow the use of optional camera-specific T-rings
Mounting
- Optical tube assembly only - mount and tripod required for proper use
- Includes tube ring set with a Vixen-style dovetail plate
- Carry handle for safe set-up, break-down, and transport
- OTA weight: 7.7 pounds
