請教 Celestron 0.63 X reducer

[anyone]

可否用於 C5 或 C6 上？ thanks !

[TONGKW]

可以。

QUOTE
This combination focal reducer and field flattener consists of a four-element multicoated 41mm lens in a metal cell. It threads onto the rear cell of 5" to 16" Celestron and Meade Schmidt-Cassegrain telescopes, making it possible to have a dual focal ratio instrument without sacrificing image quality. The reducer/corrector duplicates the rear cell thread of the telescope, allowing you to attach all standard rear cell visual and photographic accessories. The reducer/corrector converts the f/10 focal ratio of Celestron C5, C8, C9¼, and C11 telescopes (and all Meade 8" and larger f/10 telescopes) to f/6.3. The f/11 C14 telescope becomes an f/7. When used for astrophotography, it reduces exposure times by a factor of 3, with an actual field diameter of 1.5" at the film plane.
The reducer/corrector is supplied with full instructions and with plastic dust caps for both sides of the lens assembly. A rubber grip ring on the body allows for easy installation of the reducer on your scope, even when you are wearing gloves.
UNQUOTE

[anyone]

明白了，謝謝唐生！ [跪拜禮]

[funoooo]

Good Information.

[kai]

唔知有冇其他廠出同款產品呢??

[鄧登凳]

唔知有冇其他廠出同款產品呢??

有

Meade 4000 series f/6.3 reducer/flattener 見 http://www.pulsar-optical.co.uk/prod/me ... ducer.html

Antares f/6.3 SCT Focal Reducer 見http://www.optcorp.com/product.aspx?pid=8580

ps: 順便一提, Meade 2048, C5, C6等小型SCT, 由於調焦管口徑較小, 用f/6.3減焦是會出現漸暈(vingetting/暗角)的。