Vixen SD81S apochromatic Refractor

Product code: X000061
in stock
£985.00 UK Price
£820.83 (ex. VAT) International Price
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Product information

  • moderate length for visual observation and astrophotography
  • Quick change of viewing orientation with flip mirror
  • 81mm SD apohromatic, multicoated
  • Focal length 625mm, f7,7

Vixen's standard "photo-visual" SD apochromatic refractor with the focal length of 625mm.

Vixen SD apochromatic refractors feature "Super extra-low Dispersion" optical glass in its objective lens. With the use of a SD reducer HD kit or SD Flattener HD kit, the image circle of 44 mm in diameter is obtained to be used for photography with DSLR cameras with full-frame imaging sensor.

A lens of refracting telescopes has chromatic aberration which is caused by different wavelength of visible light (colours) focusing at different distances.

The Vixen SD lenses, made of FPL53 super extra-low dispersion glass, allow for correcting the chromatic aberration over a wide spectrum of light. The SD lenses focus visible rays of light from the Cray(red), d-ray(yellow), e-ray(green), F-ray(blue) to g-ray(violet) at nearly the very same position. As shown in the diagrams of spherical aberration, it verifies that the chromatic aberration is highly corrected over a wide spectrum of light with the SD lenses. Especially the g-ray, which affects image contrast, is suppressed excellently.

The SD81S delivers outstanding sharp images with high contrast for both visual and photographic applications. Brighter F7.7 images will satisfy the most demanding visual astronomer or astrophotographer.

Technical Data

Field of application
  • Deep Sky Observation
  • Deep Sky Photography
  • Lunar observation
  • Lunar photography
  • Planetary observation
  • Planetary photography
Focus Group
  • Beginners
  • Advanced Amateurs
  • Visual enthusiasts
Product Family Refractor telescope
Optical design Apochomatic Refractor
Maximum recommended magnification 160
ED glass
Focal length 625 mm
Angular resolution 1.43 arc seconds
Visual limiting magnitude (approx., mag) 11.3
Type of coating
  • Multi coated
  • Fully multi-coated
Colour of coating green
Mount Type Optics without Mount
Total length 585 mm
Total width 90 mm
Net weight heaviest part 3.6 kg

Product Info

EAN 4955295261468
Brand Vixen
Product Code X000061
Delivery Weight Package