Manufacturer: -TS Adapter
Product number: GSRCV25

EUR 39,00


incl. 19 % VAT (DE)  
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  • On stock




rating: 5.0 of 5
  • Details..
  • Technical data..
  • In the box..
TS-Optics M90 Extension Tube for the M90x1 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 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)
Optical path:25 mm (without male thread)
Material:Aluminium black anodized
TS-Optics M90 extension



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Reviews

Written by Scott Richmond
on 2023-06-30

"Good quality."

Written by Thomas Stein
on 2020-08-12

"Nutze es als Verlängerung an einem RC 8"", Qualität sehr gut, passt"

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 Holger Hartje
on 2017-05-24

"Verlängerung am kleinen Apo um die optischen Länge durch Wegfall eines Zenitprismas zu kompensieren."

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 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 Erich Daltabuit
on 2016-02-13

"für Fokus-Fotografie erforderlich"

Written by Klaus Bardey
on 2015-12-02

"stabile Verlängerung"

Written by Joaquin Zafra
on 2015-12-02

"Excellent product"

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