Manufacturer: -TS Adapter
Product number: GSRCV1172

EUR 59,00


incl. 19 % VAT (DE)  
The VAT indicated refers to that applicable in Germany. After logging in, the VAT amount is adjusted to the applicable VAT of the stored delivery country. Therefore, the final price may vary accordingly.
excl. 6.95 € shipping costs (DE)  
Please log in to calculate shipping costs to your country.
more details to the shipping costs ...

  • On stock





rating: 5.0 of 5
  • Details..
  • Technical data..
  • In the box..
TS-Optics M117 Extension Tube for the M117x1 thread - length 25 mm
Many telescopes, for example Ritchey-Chrétien telescopes, have much backfocus. This generous distance of the focus allows using a focal reducer or accessories like off-axis guiders. But if you want to attach only a camera or possibly just to do direct-vision observations, than the focuser has to be completely extended and additional 2" extension tubes have to be used. That reduces stability.


This M117 extension solves the problem. It is threaded between focuser and telescope and increases the distance betweeen telescope and focuser (usage: see image at left).

The focal plane or focal point moves closer to the focuser and you don´t need to extend the drawtube that much. For attaining precise matching, you can also thread several M117 extension tubes together. A further advantage is the better illumination. The clear aperture of the extension tube is clearly larger than the clear aperture of a 2" extension tube.
Thread at telescope side:M117x1 thread (female)
Thread at focuser side:M117x1 thread (male)
Optical path:25 mm (without male thread)
Material:Aluminium black anodized
TS-Optics M117 extension



Recommended accessories

Reviews

Written by Jean Bonnefont
on 2016-10-18

"Very useful for adjusting proper backfocus on RCs"