The AX103S is the latest in the Vixen refractor line and features a triplet ED objective lens and a rear field flattener lens.
This f8.0 APO refractor benefits from a central ED lens in the objective lens array to reduce chromatic aberration and improve contrast. An optional focal reducer speeds up the scope to f5.6 making it a superior astro imaging scope.
Includes dovetail plate (not shown)
Delivery In 1-5 Days*
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"...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)
The rear field flattener helps to deliver sharp images to the edges of the field of view.
Light gathering power is 217x and the tube is supplied with dual speed focuser, dovetail mounting plate and tubes rings.
The 60mm visual back can accept either an optional extension tube or diagonal to accommodate 50.8mm (2”) eyepieces.
An optional metal carry handle can be attached to the tube rings.
|Objective lens||103mm Triplet ED apochromatic, multi-coated|
|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)|
|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|
*A 50.8mm mirror diagonal or a 50.8mm extension tube is needed to use a 50.8mm eyepiece. **Optional photographic accessories are needed.