This telescope is checked, measured and adjusted if necessary before delivery. The focuser is set. Upon request, you will receive a meaningful quality certificate from your telescope (test report with star test, Ronchi, adjustment, with individual serial number) included! Please specify with order!
Examples of our test protocols: test recordings
How we adjust: About us

 Vixen APO 81 / 625mm - New 2-lens SD Apochromat for full-frame cameras, multi-coated

The new Vixen SD81S is a high quality ED Apochromat with special SD glass. By installing new inner screens, the SD series is suitable for full-frame cameras. In addition, these devices offer a high light-gathering capacity and are very portable due to their low weight.
♦ 81 mm aperture - 625 mm focal length - f / 7.7 aperture ratio

♦ 2-element design consisting of two ED lenses to minimize chromatic aberration

♦ Illumination of full-frame sensors thanks to optimized inner panels

♦ Excellent transportability despite the very large opening - well suited for excursions

♦ Newly developed "Dual Speed" focuser for even more precise focusing

♦ Best mechanical and optical processing "Made in Japan"

Vixen SD81S 2-lens ED Apochromat with multi-coated optics
The Vixen SD81S has special SD lens elements (Super Extra Low Dispersion) and is the largest device among the Vixen SD apochromats. These lenses are made under environmentally friendly conditions and without the use of lead. In addition, the telescope has improved inner screens, which allow the use of full-frame cameras, and thus illuminates a format of 44 mm. Despite its large opening, the SD81S is very easy to transport and therefore well suited for excursions; mobile astronomy at the highest level!

If a two-lens lens with special glasses is calculated and produced in Japan, you can be sure of excellent quality. Breathtaking sharpness and richness of detail are guaranteed with this refractor every starry night. You will not only perceive the finest color nuances on planets, but also achieve excellent results in the deep sky area - regardless of whether visually or photographically. The chromatic aberration is reduced to an imperceptible minimum, light of all wavelengths in the visual spectrum hits the focal plane exactly.

The newly developed "Dual Speed" focuser enables, thanks to the built-in micro reduction, very precise focusing in order to get the high sharpness of the lens on the chip.

The advantages and features of the SD81S:

♦ In contrast to the ED series, also suitable for full format sensors.

♦ "Dual Speed" focuser with 60 mm free opening - no shadowing due to the tightly dimensioned 2 "tubes

♦ Excellent color correction thanks to ED lenses made of "Super Extra Low Dispersion" glass

♦ Uncompromising quality "Made in Japan" - mechanical and optical

♦ Environmentally friendly production - without the use of lead
Opening: 81 mm
Focal length: 625 mm
Aperture: f / 7.7
Illuminated image circle diameter: 44 mm
Objective: multi-coated ED lenses made of SD glass
Resolving power: 1.43 "
Limit size: 11.3 mag
Tube diameter: 90 mm
Tube length: 585 mm
Tube weight: 3.6 kg
Connection on the eyepiece side: 2 "
Dew cap diameter: 100 mm