Celestron f/6.3 Reducer/Corrector

C8は焦点距離が長くて、APS-Cサイズのカメラでは月や太陽が一枚で撮影できない。 もどかしかったんで買っちまいました。 EOS kiss X7iでバッチリ一枚に全体が収まってくれています。 収差のコレクター機能もあるから周辺の像も綺麗になってると思う。 たかがレンズにこの値段！ 内外価格差、円安このヤローと思わないでもないけど、買っちゃった後はまあまあ満足しております。 取り付け場所はC8に直接。その先にビジュアルバックを付ければ眼視にも対応している。

Excellent optics. Reduces exposure times. Quality manufacturing.

I have Celestron C8, this has a focal ratio of F/10. You don't necessarily need to know what that means but Astrophotographers would describe this as a "slow" ratio. Great for planetary obsevation. For nebulae, star clusters etc, still a great all-rounder, but some nebulae are quite large and/or diffuse. The focal reducer gives F/6.3. (faster). This means a wider and brighter field, though magnification can be applied to it, as normal. The Pleiades are almost all available in a low powered eyepiece, the moon is fully observable. When I went comet hunting, it gave me a better all-around view, before zooming in for the Nucleus and Coma. This may be classed as a luxury item, but it Does enrich the brightness and gives wider angle vistas. There are comments that it flattens the field. This means that at the margins of the view, in an SCT, the stellar points of light, can become slightly elongated. This is corrected with this lens. A good purchase for me, I would recomend, a good astronomer's tool, gives options. Is easy to add and take off the Telescope tube, in low light, thanks to the solid/well spaced screw thread.

Der Reducer macht bei mir alles richtig. Das Bild bleibt zum Rand hin deutlich schärfer und hat keine auffällige Verzeichnung, Krümmung mehr. Bis jetzt sehr zufrieden.

Bought for my Celestron C5. Works well, nicely machined, solid and let's you have two telescopes for the price of one!

Ainda não tive a oportunidade para utilizar. Mas o produto parece ser de boa qualidade, bem construído, em alumínio fundido e pintado, lente multi-coated.