Vixen AX 103S Flat Field APO Refractor

Vixen AX 103S Flat Field APO Refractor

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About this product

Model:  vixen_ax103s
Part Number:  26144

Premium quality Japanese-made apochromatic 4-element refractor. 

"...what makes this scope special compared to most other refractors is that it has a rear field-correction lens as well as its extra-low dispersion, apochromatic, multicoated 4-inch triplet objective (main) lens.

The rear lens corrects a problem common to normal refractors, the views of which suffer from ‘field curvature’."  Steve Richards writing for BBC Sky @ Night magazine (Feb 2010)


From the same review

"Our first hop was back to the region of Vega for a look at M57, the Ring Nebula, and we were rewarded with a lovely view of this celestial smoke ring. Nearby, the Double-Double quadruple star (Epsilon Lyrae) was split with ease using the 5mm eyepiece, and the high contrast view was stunning.

Heading for closer prey, Jupiter was a small but glorious sight with obvious bands and beautifully bright, pin-prick moons. The full Moon was framed well in the 20mm eyepiece and the lack of colour fringing was a testament to the excellent optics. The Pleiades, too, was a memorable sight, although we couldn’t fit the whole cluster into the field of view of the 20mm eyepiece.

Digital camera sensors really show the effects of field curvature, so we were keen to see how well this refractor coped with this problem. We analysed an image of the sky to see how ‘flat’ it appeared and were very impressed with the result, with pin-point stars right to the edge of the frame."


A Vixen 0.7x focal reducer is also available for imaging at f5.6

Vixen AX 103S Optical Path pdf



Objective lens 103mm ED four-element (3+1) Apochromatic
Focal length (Focal ratio) 825mm (F8)
Resolving power & limiting magnitude 1.13 arc sec & 11.8
Light gathering power 217x
Tube size & weight (OD) 115mm x (L) 687mm, 4.6kg (10.1lb)
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 2" focuser
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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