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Focal Reducer, Black

页面含机器翻译，中文仅供参考，以原文为准

Celestron 星特朗

401 评论

¥1,018.36

12期7.5%费率，每月仅 ¥91.32 最高12期，多种分期方式可选了解更多

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这款焦距减距器和场地矫正器镜头配件适用于所有 Celestron 5 英寸、6 英寸、8 英寸、9 1/4 英寸、11 英寸和 14 英寸 Schmidt-Cassegrain 望远镜
这款巧妙的配件使您可以拥有双焦比仪器,而不会牺牲图像质量
减速器/修正器是 f/6.3 适用于 C5、C6、C8、C9¼ 和 C11 望远镜,f/7 适用于 C14 望远镜
原文
- This combination focal reducer and field corrector lens accessory works with all Celestron 5", 6", 8", 9 1/4", 11" and 14" Schmidt-Cassegrain telescopes
- This clever accessory makes it possible to have a dual focal ratio instrument, without sacrificing image quality
- The Reducer/Corrector is f/6.3 for C5, C6, C8, C9¼ and C11 telescopes and f/7 for the C14 telescope

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401 评论

商品描述

这款组合焦距减速器和场地矫正器镜头配件适用于所有 Celestron 5 英寸、6 英寸、8 英寸、9 1/4 英寸、11 英寸和 14 英寸 Schmidt-Cassegrain 望远镜。这款巧妙的配件使您可以拥有双焦比仪器,而不影响图像质量。减速器/校正器为 f/6.3,适用于 C5、C6、C8、C9¼ 和 C11 望远镜,f/7 适用于 C14 望远镜。如果使用任何 Schmidt-Cassegrain 望远镜提供宽视野。用于天文摄影,可减少 3 个因素的曝光时间。 Celestron 不提供 f/6.3 Schmidt-Cassegrain 望远镜,因为设计不实用,中央障碍大,形成对比度损失。这增加了无法为某些物体使用更长的焦距,导致 Celestron 设计四元素、全镀膜 f/6.3 减速器/矫正器。视觉和摄影效果都令人惊叹。 #94175 减速器/校正镜头与 Celestron EdgeHD 光学系统不兼容。

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此商品在美国亚马逊上最有用的商品评论

美国亚马逊： 124 条评论

Lewis Weinstock

Valuable accessory for DSO viewing and photography

2020年8月12日 - 已在美国亚马逊上发表

样式: 修正液已确认购买

I read about such corrective lenses in a book on astrophotography. The goal of the lense is to effectively decrease the f value of your scope, increasing light gathering ability and the field of view. This lense accomplished both goals for my Celestron NexStar 6SE. It changed the scope from F10 to F6.3 and increased the FOV so that objects that formerly were too big to image "whole" now were imaged completely. The visual brightness of objects was increased and the resulting exposure times decreased. I keep this lense on the scope by default and only remove it (restoring the original F ratio) when intending to view and image planets or split close double stars. I have not noticed any distortion in the images when the lense is in place. I count this purchase as one of my best decisions when acquiring accessories.

19 个人发现此评论有用

Railbird

Solid Construction, As Advertised Optical Performance.

2017年4月30日 - 已在美国亚马逊上发表

样式: 修正液已确认购买

My main motivation for buying this was to fit the sun (and moon) into the field of view of my APS-C (24 x 16 mm) camera sensor using my Celestron 8" SCT (2000 mm FL). Using a full frame sensor is not an option since the C8 will vignette. This device also allows a slightly wider field of view and lower f-number for deep space object astrophotography.

Handy reference numbers for those wishing to photograph the Eclipse or just the entire moon: Max focal length when using an APS-C camera is about 1260 mm. When using a full frame, about 1900. But only if you can center the target and keep it centered. (To photograph the moment of eclipse use 400mm APS-C/600mm Full Frame and no solar filter.)

This device is not useful for solar system astronomy, except the sun or moon, or when using eyepiece projection photography. But you can always just take it off.

One huge advantage of this device is that you get just about the same performance as you would with an Edge HD telescope, and the field flattener costs half as much. If you buy an Edge HD 8" OTA you get a built-in field flattener, but still have the longer focal length, and hence smaller field of view and slower f-number. To see the whole sun or moon, or a more of the Pleiades in a camera, you would have to buy another focal length reducer, about $300 bucks. Since the Edge HD comes at a $400 buck premium over the SCT you spend an additional $700 bucks to get to the same optical setup you get with the the SCT plus this item at about $150 bucks. Go with this plus the SCT and save $550 bucks, and you will even have less glass between you and the stars to boot.

The construction is very solid, you should have no problem hanging a DSLR (or better a mirrorless camera) off of this thing.

24 个人发现此评论有用

gustenm

Works great

2020年2月19日 - 已在美国亚马逊上发表

样式: 修正液已确认购买

Very happy with it. Attached easily and works great. This is Orion nebula using this reducer on the Celestron 6se. My first night using it. Makes a difference especially if attempting to do any astrophotography.

12 个人发现此评论有用

Amazon Customer

A Must Have...

2020年6月16日 - 已在美国亚马逊上发表

样式: 修正液已确认购买

Hi: I own a 8” CST and native f/10. The f/10 sucks brightness from any object! It you are interested in viewing anything other than planets, I personally believe and confirmed mathematically that the f/6.3 focal reducer is a must own. My scope now rocks! Improves “brightness” performance for absolutely any type or make of eyepiece; fact mathematically. This is a must have for any size CST if you wish to enjoy visual observations of DSOs.

8 个人发现此评论有用

Jahan Dawlaty

Worked well, easy to install

2021年7月30日 - 已在美国亚马逊上发表

样式: 修正液已确认购买

I put this on my celestron 8se SC telescope with the goal of increasing the field of view (because I have a zwo asi224mc camera with a relatively small sensor area). It was easy to install and worked quite well. Before buying it, I was worried that the focal plane would shift so much that I would not be able to focus within the limits of my focusing knob. But that worry was unfounded and I got to focus easily. I could fit the Dumbbell nebula with enough contextual background in the field of view of my camera. As far as I could tell, I did not observe significant vignetting. My plan is to leave it in the back of the telescope forever and only take it off when doing planetary observation or imaging (which requires higher magnification).

3 个人发现此评论有用

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Celestron 星特朗 C 望远镜 Celestron f/6.3 减速器校正器 {"isOriginalText":"true","showTooltip":"false","tooltipContent":"中文翻译，点击查看"} 原文 Celestron 94175 Field Lens Corrector/Focal Reducer, Black 页面含机器翻译，中文仅供参考，以原文为准

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商品描述 {"isOriginalText":"true","showTooltip":"false","tooltipContent":"中文翻译，点击查看"}

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此商品在美国亚马逊上最有用的商品评论

Celestron 星特朗 C 望远镜 Celestron f/6.3 减速器校正器

原文

Celestron 94175 Field Lens Corrector/Focal Reducer, Black

页面含机器翻译，中文仅供参考，以原文为准

商品描述