Vixen SD81S Apochromatic Optical Tube Unit

Name: Vixen SD81S Apochromatic Optical Tube Unit
Brand: Vixen
SKU: VE#26146
Price: 1349 EUR

Product.Nr.: VE#26146

EAN: 4955295261468

products condition: new

Manufacturer: Vixen

1.349,00 EUR
incl. 19 % VAT

excl. shipping costs

Gewöhnlich versandfertig in 24 Stunden
delivery time : 1-2 Tage
weight 4,7 kg

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product description

81/625mm SD-Apochromat (f/7.7)
Made in Japan

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 optional Vixen SD reducer HD kit or optional Vixen 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.

The SD lens suppresses residual chromatic aberration far below the threshold of visibility.

A lens of refracting telescopes has chromatic aberration which is caused by different wavelength of visible light (colors) 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 Vixen 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.

Optical tube of a moderate length for visual observation and astrophotography.

The optical tubes of the SD81S, SD103S and SD115S are designed to be shorten to its length. It is convenient to carry and setting up and balancing the optical tube easier.

Quick change of viewing orientation with flip mirror.

The provided flip mirror allows you to change light pass for comfortable observing posture. With two eyepieces of different focal length attached to the flip mirror, you can switch magnifications quickly.

Versatile accessories for visual observation and astrophotography.

The focuser drawtube has 60mm threads in diameter for attaching a variety of optional eyepieces and accessories for visual and photographic purpose.

Optional accessories to expand your pleasure of astrophotography.

This kit consists components for prime focus astrophotography with the SD81S, SD103S or SD115S optical tube. This reducer is made to be used in combination with an accessory such as a wide photo adapter 60DX, sold separately.

Objective lens	81mm SD apohromatic
Focal length (Focal Ratio)	625mm (f/7.7)
Type	SD-Apochromatic
Coating	multicoated
Light gathering power	134x unaided eye
Resolving power	1.43"
Limiting magnitude	11.3mag
Finder scope	XY Red dot finder II (1xaiming device)
Eyepieces	Optional
Focusing mechanism	Rack-and-pinion, with lock knob
Adapter thread/visual Back	M60mm/50.8mm Flip Mirror diagonal (50.8mm (2") / 2x42mm for T2-ring, 31.7mm push-fit (1.25"))
Accessories	Tube rings, Dovetail tube plate, Metal carry handle
Photography	Usable with Prime focus, Eyepiece projection and Afocal imaging
Solar observation	Available with Vixen Sun projection screen set B
Tube size	90mm
Tube length	585mm
Tube weight	3.6kg (Net 2.3kg)