This model is discontinued but a replacement with Japanese-made optics is in the pipeline.
The Vixen NA140mm SSF Flat Field Neo-Achromat refractor employing a fast f5.7 4-element Petzval-like optical design. The rear element enables a normally slow f-ratio objective lens (with lower chromatic aberration) to achieve a faster f-ratio and a flat field.
Whilst not a true Apochromat this fast large-aperture telescope is a very good choice for those using large sensor CCD cameras for high quality narrow-band astrophotography, without requiring a field flattener.
Broadband CCD or DSLR imaging is also possible but would require extra image processing to remove blue halos around bright stars.
Visually the the Vixen NA140mm SSF delivers the sharp, bright, contrasty views you would expect from a refractor of this aperture and design.
Build quality is very nice indeed. This is the 'only' Chinese-manufactured Vixen telescope where final assembly and quality control takes place at Vixen's own Japanese factory. The dual-speed rack & pinion focuser is very strong so can handle large heavy cameras. Vixen's 50.8mm Compression Ring Eyepiece Adapter is included.
The Optical Tube Assembly weighs a little under 7kg and has a focal length of 800mm. There’s a built-in dew shield and Vixen’s dual-speed focuser is supplied as standard together with tube rings and dovetail mounting plate.
Vixen NA140 SSF Optical Path pdf
Vixen NA 140 SSF Review pdf by Anthony Emberson
| Objective lens || 140mm Neo-achromatic, multi-coated |
| Focal length (Focal ratio) || 800mm (f5.7) |
| Resolving power, limiting magnitude || 0.82 arc sec., 12.5 |
| Light gathering power || 400x |
| Tube size & weight || (OD) 140mm x (L) 1024mm, 6.5kg (14.3lb) |
| Finderscope || Optional |
| Adapter thread / visual back || 60mm on scope body. 42mm for T-mount, 31.7mm push-fit, 50.8mm Compression Ring Eyepiece Adapter |
| Accessories included || Dovetail adapter, tube rings & dual speed focuser |