75868 NA140SSf
This 140mm refractor has a fast focal ratio of f5.4. Deep sky objects are easily visible and astro-imagers looking for a fast instrument will be impressed with the NA140’s performance.
The advanced 4-element objective lens, set in two groups, minimises residual chromatic aberrations. With its Petzval-like correcting lens at the rear, this neo-achromatic telescope is specifically designed to provide improved colour and a flat field, making it well-suited to astrophotography.
The tube weighs 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.
Includes dovetail plate (not shown)
2011 models are supplied with 75971 50.8mm
Compression Ring Eyepiece Adapter
| 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* 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.
