Manufacturer: Celestron
Product number: CE820775

EUR 159,00


incl. 19 % VAT (DE)  
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rating: 4.7 of 5
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Celestron f/6.3 Reducer and Corrector with 2" female thread for Schmidt-Cassegrain telescopes
The corrector shortens the focal length of all Schmidt-Cassegrain telescopes by a factor of 0.63. The optical correction system levels the slightly curved image field of all Schmidt-Cassegrain telescopes. The corrector has a 2" SC thread on the telescope side and camera side which fits Celestron and Meade SC telescopes.

Product description of the manufacturer:
This useful lens corrector system kills several birds with one stone: the 4-lens focal reducer shortens the focal length of all Schmidt-Cassegrain telescopes by a factor of 0.63.

The focal ratio changes to the same extent from 1:10 to 1:6.3, resulting in a much larger field of view and 3 times shorter exposure times.

The optical correction system levels the slightly curved image field of all Schmidt-Cassegrain telescopes. This provides a fully corrected, vignetting-free "richfield" field of view of 24 mm diameter.

The focal lengths of the Celestron SC telescopes change as follows:
C5: from 1250 to 788 mm / f 6.3
C8: from 2000 to 1260 mm / f 6.3
C9: from 2350 to 1480 mm / f 6.3
C11: from 2800 to 1764 mm / f 6.3
C14: from 3910 to 2457 mm / f 7.3


The Celestron focal reducer can also be used visually. It has the Celestron SC thread on both sides and is screwed directly to the telescope tube. It can also be used in combination with the Radial Guider for photography and CCD cameras (!).
Connection thread telescope side:female 2" SC thread
Connection thread camera side:male 2" SC thread
Optimum working distance from the SC thread:85 mm +/- 15%.
Lenses:Four lenses with air gap - multicoated
Shortening factor:0.63 times
Corrected image field:24 mm diameter
Clear aperture:41 mm
Celestron Reducer


Question:
How do you have to measure the working distance?

Answer from Teleskop-Service:
The working distance is measured from the beginning of the connection thread on the housing of the corrector (see example picture):




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Reviews

Written by Ola Klafstad
on 2021-03-30

"An excellent focal reducer. Be aware that for astrophotography with a full frame DSLR, you will ?loose? the edges of the frame because of a wider field. This is no problem if you cropping the picture afterwards. "

Written by Bjoern Forsaa
on 2020-02-01

"Works very good with the SCT 8"

Written by Bernd Limburg
on 2020-01-11

"Tut was er soll."

Written by Steffen Wetzel
on 2019-11-20

"Ich habe diesen Reducer visuell am C11 getest. Der erste Eindruck am terrestrischen Objekten war beeindruckend. Das Bildfeld wirkt angenehm eben. Mir war es leider nicht möglich, diesen unter astronomischen Bedingungen innerhalb von 14 Tagen zu testen, da das Wetter nicht mitspielte. Bei der Verwendung von langbrennweitigen Okularen wurde der Schatten des Fangspiegel sichtbar, da dieses für diese verkürzte Brennweite zu langbrennweitig ist. Mit Reducer sind Okulare ab 24mm abwärts einsetzbar. Ich konnte leider nicht testen, ob die Lichtstärke mit Reducer sich so positiv auswirkt, dass ich lieber das C11 mit Reducer und 24mm-Okular bei flächenhaften Nebelobjekten, statt ohne Reducer und 55mmm-Okular benutzen würde."

Written by Gerburg Unger
on 2017-04-29

"Ich verwende den Reducer am 8"" SC. Perfekt ist die variable Brennweite."

Written by william PELLISSARD
on 2017-01-14

"Très bon matériel !"

Written by Ulrich Heuser
on 2016-08-09

"Sehr gut verarbeitet. Erste Tests fallen positiv aus."

Written by Attila Lenart
on 2016-01-09

"-excellent quality and performance -robust design -excellent for astrophotography"

Written by Thomas Haeuseler
on 2015-12-18

"Der Reducer erfüllt die Erwartungen an meinem C11 voll"