Celestron C5 會係支好既便攜望遠鏡嗎?

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skyfiction
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註冊時間: 週六 23 8月, 2014 12:04

Celestron C5 會係支好既便攜望遠鏡嗎?

文章 skyfiction » 週日 27 8月, 2017 15:19

Celestron C5 會係支好既便攜望遠鏡嗎?
睇spec話得2.72kg
好似好輕咁

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鄧登凳
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Re: Celestron C5 會係支好既便攜望遠鏡嗎?

文章 鄧登凳 » 週一 28 8月, 2017 12:32

skyfiction 寫:
週日 27 8月, 2017 15:19
Celestron C5 會係支好既便攜望遠鏡嗎?
睇spec話得2.72kg
好似好輕咁
如果主要是用於目視, 而便攜是主要考量, 愚見認為是好的選擇。

強項: 輕便, 性價比高
弱項: 焦比偏高, 反差偏弱

Chanlunlun
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Re: Celestron C5 會係支好既便攜望遠鏡嗎?

文章 Chanlunlun » 週三 30 8月, 2017 10:32

Not at all good.

The focal length of C5 is 50 inches, or at 1270 mm giving a minimum amplification around 40X. You cannot go lower because the baffle tube reduces the field of vision. Theoretically a 5 incher should offer a minimum amplification of 20X, at exit pupil of about 6 mm, maintaining no energy loss to the human eye and provide a maximum field of view of about 3 to 4 degrees, depending on which type of eyepiece under use.

This means that a C5 is unable to perform in the rich field application which is easily handled by a RFT Newtonian. A C5 excels in high power but unable to perform in rich field application, making it a mediocre choice to view, say , the total solar eclipse.

大黃傻貓GARFIELD
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Re: Celestron C5 會係支好既便攜望遠鏡嗎?

文章 大黃傻貓GARFIELD » 週三 30 8月, 2017 11:28

Chanlunlun 寫:
週三 30 8月, 2017 10:32
Not at all good.

The focal length of C5 is 50 inches, or at 1270 mm giving a minimum amplification around 40X. You cannot go lower because the baffle tube reduces the field of vision. Theoretically a 5 incher should offer a minimum amplification of 20X, at exit pupil of about 6 mm, maintaining no energy loss to the human eye and provide a maximum field of view of about 3 to 4 degrees, depending on which type of eyepiece under use.

This means that a C5 is unable to perform in the rich field application which is easily handled by a RFT Newtonian. A C5 excels in high power but unable to perform in rich field application, making it a mediocre choice to view, say , the total solar eclipse.
I agree, it is a scope for causal observation in a light small package.

skyfiction
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Re: Celestron C5 會係支好既便攜望遠鏡嗎?

文章 skyfiction » 週一 27 11月, 2017 13:16

How much $ C5 now?

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