Manufacturer: -TS Adapter
Product number: GSRCV50

EUR 49,00


incl. 19 % VAT (DE)  
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rating: 5.0 of 5
  • Details..
  • Technical data..
  • In the box..
TS-Optics M90 Extension Tube for the M90x1 thread - length 50 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 M90 extension solves the problem. It is threaded between focuser and telescope and increases the distance betweeen telescope and focuser - 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 M90 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:M90x1 thread (female)
Thread at focuser side:M90x1 thread (male), 8 mm long
Optical path:50 mm (without male thread)
Free aperture:77 mm
Material:Aluminium black anodized
TS-Optics M90 extension



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Reviews

Written by Alois Multerer
on 2023-08-30

"Sehr schnelle Lieferung und wie immer alles perfekt."

Written by Martin Haring
on 2023-02-08

"Wie beschrieben "

Written by Vyacheslav Nesterenko
on 2020-08-06

"Alles passt!"

Written by Michel Llibre
on 2018-04-28

*****

Written by Udo Hübner
on 2018-02-13

"Keine Kritik möglich"

Written by Klaus-Peter Janovics
on 2018-01-06

Perfekt

Written by Andrea Alessandrelli
on 2017-08-16

"Good product"

Written by Frédéric Jeanrenaud
on 2017-06-21

"Sehr gut"

Written by Olegs Melnikovs
on 2016-09-07

"My Canon EOS 1100d with these extension tubes 25 mm + 50 mm are well focused on my Ritchey GSO 6""."

Written by Zdenek Popel
on 2016-06-01

"Das Produkt ist nötig um backfocus zu erreichen. Nicht nur mit Okulqar, sondern auch für DSLR kamera. Das Produkt kann Ich empfehlen für allen, in erster Reihe für sehr profi Ausführung. "

Written by Dirk Zillmer
on 2016-05-17

"für RC8 erforderlich bei fotografischem Einsatz"

Written by Ian Whiteley
on 2015-12-02

"An essential item when atteching a camera so that the focusser works within its range"