Vixen SD81S APO Refractor Telescope
- Vixen 81 mm (3.2") Aperture Apochromatic Refractor Telescope
- Super Extra Low Dispersion (ED) glass Objective
- Apochromatic Performance Refractor
- Focal Length is 625 mm
- Focal Ratio is f/7.7
- Includes a Flip Mirror Diagonal
- Includes a Red Dot Finder
- Capable of doing visual observing or astrophotography
- All air-to-glass surfaces on the objective are multi-coated
- Good choice for more serious astronomers
This is a Vixen 81 mm Aperture Apochromatic Refractor Telescope. This model SD81S APO Refractor from Vixen is a nice medium size Apochromatic telescope for those observers or photographers who need a smaller lighter weight scope for travel or for other applications. This Vixen refractor provides pinpoint images of the stars as well as any other celestial objects due to its optical design. All air-to-glass surfaces on the objective lens are multi-coated to maximize light transmission.
This Vixen (new) SD Apochromatic refractor features high-performance Super ED Glass made of the most modern, high performance, low dispersion glass to deliver extremely clear and sharp images by eliminating chromatic (color) aberration. The SD glass is designed to gather all g-ray (purple), C-ray (red), F-ray (blue), d-ray (yellow), and e-ray (green) wavelengths to about a “0” value in one focal plane, which makes this telescope provide great images, sharp and without color fringing. Its small diameter, shorter length, and light weight make it a good scope for your star party or for carrying to your favorite dark site, or just in your own back yard!
The telescope has an aperture of 3.2" (81 mm) a focal length of 625 mm for a focal ratio of f/7.7. It has a light gathering power of 134x. The light baffle positions in the drawtube are designed to take advantage of the entire field of view of a DSLR camera with a full frame image sensor. When used in combination with the optional Vixen SD Reducer HD Kit or SD Flattener HD Kit , you will have a 44 mm image circle with full-format (D)SLR cameras. This Vixen SD81S Apochromatic Refractor Telescope is an easy-to-use optical system which will be appreciated by any intermediate to advanced astronomers, especially those doing astrophotography. This telescope is easy to maintain and requires almost no routine adjustments.
This Vixen SD81S Refractor Telescope includes a Red Dot Finder, a convenient Flip Mirror Star Diagonal, Dual Rings, Vixen Dovetail Rail for mounting, and a Carry Handle. The Reducer DH, is optional (sold separately), incorporates the SD Flattener DH and it is essential for wide field astrophotography.
NOTE: This telescope does NOT include any eyepieces, and it does NOT include a mount or a tripod. It does NOT include a Reducer or a Flattener.
|Aperture:||3.2" (81 mm)|
|Focal Length:||625 mm|
|Resolving Power:||1.43 arc sec|
|Light Gathering Power:||134x|
|Finder Scope:||Red Dot Finder|
|Adapter Thread:||60 mm, 42 mm/ For T-Ring/50.8|
|Visual Back:||50.8 mm & 31.7 mm Push Fit w/Flip Mirror Diagonal|
|Optical Tube Length:||23" (585 mm)|
|Optical Tube Diameter:||3.5" (90 mm)|
|Optical Tube Weight:||7.2 lb|
|Photography:||Prime Focus, Eyepiece Projection, and Afocal Imaging|
|Eyepieces:||None; Not Included|
|Accessories:||Tube Rings, Dovetail Plate, Flip Mirror Diagonal, Carrying Handle|