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ED81S Refractor OTA

When the ED81S was introduced, it set a new standard for APO refractors. The combination of better colour correction from the new extra low dispersion (ED) glass and brighter images from its fast f7.7 focal ratio will satisfy the most demanding visual astronomer or astro-photographer.

This 81mm aperture tube is extremely compact and lightweight and comes with the Vixen dual speed focus system as standard.

Light gathering power is 134x and the unit is supplied with tube rings and dovetail mounting plate for quick and easy connection to any Vixen mount.

Objective lens 81mm ED Apochromatic, multi-coated
Focal length (Focal ratio) 625mm (f7.7)
Resolving power, limiting magnitude 1.43 arc sec., 11.3
Light gathering power 134x
Tube size & weight (OD) 90mm x (L) 583mm, 2.3kg (5.1lb)
Finderscope Optional
Adapter thread / visual back 60mm on scope body. 42mm for T-mount, 31.7mm push-fit, 50.8mm* push fit on optional flip mirror
Accessories included Dovetail adapter, tube rings & dual speed focuser
Photography** Prime focus, Eyepiece projection and afocal imaging
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