Vixen SD 81S APO Refractor

Vixen SD 81S APO Refractor


Incoming - Shipped 2-4 working days.

Model:  vixen_SD81S
Part Number:  76146
Brand:  Vixen


NEW updated version of the highly respected ED 81S Mk-II. 

The Vixen ED refractor range has been redesigned to allow use of full frame DSLR camera sensors. The new models are designated SD (Super extra low Dispersion glass).

Thanks to an improved baffle system, the incoming light near the edge of field of view has been increased when compared to the previous generation model.

The SD range also have their own dedicated field flatteners and focal reducer that help deliver pin sharp star images across the field of view of a 35mm full-frame image sensor.

Fitted with a sturdy 2-inch dual-speed Rack & Pinion focuser. 

NOTE: Eyepieces shown in photo are not included. 



Objective lens 81mm ED doublet
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, 3.6kg (7.92lb)
Finderscope XY red dot
Adapter thread / visual back 60mm on scope body. 42mm for T-mount, 31.7mm push-fit, 50.8mm* push fit on included flip mirror
Accessories included Flip-Mirror, dovetail adapter, tube rings, finder, carry handle
Photography** Prime focus, eyepiece projection and afocal imaging

*A 50.8mm mirror diagonal or a 50.8mm extension tube is needed to use a 50.8mm eyepiece. **Optional photographic accessories are needed.



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