Manufacturer: -TS Zubehör
Product number: TSCH

EUR 44,90


incl. 19 % VAT (DE)  
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Product expected to be available from 01.09.2024

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rating: 4.6 of 5
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Collimating eyepiece for Newtons and refractors - Cheshire eyepiece 1,25"
Allows perfect collimation of Newtonian telescopes and refractors.

The Cheshire eyepiece is the classic collimation tool for Newtons and refractors. Light is directed into the optical path through a mirror-polished aluminum insert. The collimation can be checked through a peeping hole. At the telescope end of the Cheshire eyepiece there is an additional crosshair.

The Cheshire eyepiece has a very wide stop edge. This means that even with somewhat larger 1.25" focusers, an exact stop is always defined.

Newtonian telescopes: With a correctly adjusted telescope, you will see the crosshairs, the centre mark of the primary mirror and the reflected image of the secondary concentrically superimposed. Misalignment manifests itself in a shift of these elements towards each other.

Refractors: With a refractor, you get an image that ideally shows several concentrically arranged rings. The number of these rings depends on the type of objective. If the rings are not concentric, but shifted against each other, the telescope must be adjusted.

Practical tip from TS
When adjusting refractors, the eyepiece should always be straight-sighted, i.e. never used with a star diagonal, because the mirror itself can also introduce inaccuracies into the system. When adjusting Newtonian telescopes, the eyepiece should not be clamped, but inserted unclamped into the focuser with the tube horizontal and the focuser pointing vertically upwards.

Collimation instructions as PDF file
Teleskop-Service has created collimation instructions:
Collimation guide for Newtonian telescopes.
Collimation guide for refractors.

suitable for:Newtonian telescopes and refractors
Telescope connection:1,25"
Other:Crosshair
adjustment eyepiece



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Reviews

Written by Burkhard Wallesch
on 2020-06-26

"Wie beschrieben. Erfüllt seinen Zweck. "

Written by Dietmar Heineke
on 2020-02-11

"Für einen GSO 8 Zoll ein passendes sehr nützliches Teil. Hatte später bei der Kollimation am Stern kaum noch etwas zu tun."

Written by Menno Blaauw
on 2019-11-08

"Feels solid and works perfect. Easy to use and looks nice and good finished."

Written by Ton Timmermans
on 2018-07-05

"ein muss fur jeden newton"

Written by Aleksandar Shulevski
on 2018-01-20

"Very good. Improves collimating precision."

Written by Wolfgang Seitinger
on 2017-03-21

"Zum Justieren eines Dobson Teleskopes, statt bzw. zur Ergänzung eines Lasers."

Written by David García
on 2016-12-14

"I´ve tried several collimation tools to collimate my 10"" Lightbridge dobsonian telescope. I think this TS Cheshire eyepiece is the best I´ve used. "

Written by Juha Harju
on 2016-10-05

"Product possibly super. ***"

Written by Gerald Minasch
on 2016-09-22

"Das Okular ist in einer kleinen Schachtel verpackt welche sich auch für die spätere Aufbewahrung eignet. Die Verarbeitung ist wie erwartet sehr gut und es erfüllt seinen Zweck. Die Feinjustierung des Fangspiegels (Ausrichtung auf die Mitelmarkierung des Hauptspiegels) und die Hauptspiegeljustage geht damit recht schnell und einfach. Für Justierung des Hauptspiegels hat das Okular an der Seite eine Öffnung in die mit einer kleinen Taschenlampe oder der LED vom Smartphone geleuchtet werden kann. Für die Zentrierung des Fangspiegels (z.b. nach einem Ausbau) habe ich mir noch einen Concenter zugelegt. "

Written by Arvid Feldhusen
on 2016-09-13

"Get the job done!"

Written by Tobias Nagel
on 2016-06-14

Funktioniert

Written by Dirk Zillmer
on 2016-05-17

"eigentlich braucht es jeder"

Written by Antoon Maeseele
on 2016-03-15

"collimation of my LO astrocamera"

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