出幾台大口徑反射及折射

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鄧登凳
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文章: 9497
註冊時間: 週一 03 8月, 2009 17:15
來自: 3rd planet of solar system

文章 鄧登凳 » 週四 04 11月, 2010 20:54

anthony168 寫:F?
152mm diameter, 1000mm focal length, F-ratio = 1000/152 = 6.5789473684210526315789473684211 :lol:

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anthony168
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文章: 571
註冊時間: 週日 15 8月, 2010 18:42
來自: 將軍澳

文章 anthony168 » 週五 05 11月, 2010 00:37

tks, Tung sir. Is it the formula that can apply to calculate all F ratio for all type of telescope?

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夸克星
文章: 9497
註冊時間: 週一 03 8月, 2009 17:15
來自: 3rd planet of solar system

文章 鄧登凳 » 週五 05 11月, 2010 01:54

anthony168 寫:tks, Tung sir. Is it the formula that can apply to calculate all F ratio for all type of telescope?
That is the definition of F-ratio

From Princeton University:
http://wordnetweb.princeton.edu/perl/webwn?s=focal%20ratio 寫:•F-ratio : (n) focal ratio, f number, stop number, speed (the ratio of the focal length to the diameter of a (camera) lens system)

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KingArthur
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文章: 2398
註冊時間: 週四 14 8月, 2003 17:50
來自: Lantau

文章 KingArthur » 週五 05 11月, 2010 14:38

this 6" refractor can be very useful if stationed in Cheung Sha, interesting.

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tommy128268
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文章: 214
註冊時間: 週四 01 7月, 2010 23:34
來自: KWUN TONG

文章 tommy128268 » 週五 05 11月, 2010 16:46

關老板
除左第3之外....1,2,4 有無圖睇呀

BossKwan
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文章: 1175
註冊時間: 週五 01 10月, 2004 03:07

文章 BossKwan » 週二 15 3月, 2011 14:35

Reminder!!

Some of them still available!!

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夸克星
文章: 9497
註冊時間: 週一 03 8月, 2009 17:15
來自: 3rd planet of solar system

文章 鄧登凳 » 週二 15 3月, 2011 15:09

Dear Boss Kwan,

Is the focuser on Item 2 1.25" or 2"?

Does it comes with the rings and dovetail mount plate?

Any photo?

Regards,
Tang

BossKwan
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文章: 1175
註冊時間: 週五 01 10月, 2004 03:07

文章 BossKwan » 週二 15 3月, 2011 15:58

鄧登凳 寫:Dear Boss Kwan,

Is the focuser on Item 2 1.25" or 2"?

Does it comes with the rings and dovetail mount plate?

Any photo?

Regards,
Tang
Dear Brother Tang,

Focuser is 2" and with 1.25" adapter.
(In other words, you can put into a 2" Coma corrector)

Yes, the scope comes with tube-rings and dovetail plate.

Also, if this scope can be replaced with an 10:1 dual-speed focuser, it could become a more powerful and user-friendly astrograph, but with far lower price. I have an idea of providing any purchasers with all-related information (Including service of ordering the focuser and giving helps on the modification)

Peter

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鄧登凳
夸克星
文章: 9497
註冊時間: 週一 03 8月, 2009 17:15
來自: 3rd planet of solar system

文章 鄧登凳 » 週二 15 3月, 2011 16:19

BossKwan 寫:
鄧登凳 寫:Dear Boss Kwan,

Is the focuser on Item 2 1.25" or 2"?

Does it comes with the rings and dovetail mount plate?

Any photo?

Regards,
Tang
Dear Brother Tang,

Focuser is 2" and with 1.25" adapter.
(In other words, you can put into a 2" Coma corrector)

Yes, the scope comes with tube-rings and dovetail plate.

Also, if this scope can be replaced with an 10:1 dual-speed focuser, it could become a more powerful and user-friendly astrograph, but with far lower price. I have an idea of providing any purchasers with all-related information (Including service of ordering the focuser and giving helps on the modification)

Peter
Dear Boss Kwan,

I am interested in this one. Please suggest when you will be around and I can come to visit your office.

Regards,
Tang

BossKwan
中子星
文章: 1175
註冊時間: 週五 01 10月, 2004 03:07

文章 BossKwan » 週二 15 3月, 2011 17:09

鄧登凳 寫:
BossKwan 寫:
鄧登凳 寫:Dear Boss Kwan,

Is the focuser on Item 2 1.25" or 2"?

Does it comes with the rings and dovetail mount plate?

Any photo?

Regards,
Tang
Dear Brother Tang,

Focuser is 2" and with 1.25" adapter.
(In other words, you can put into a 2" Coma corrector)

Yes, the scope comes with tube-rings and dovetail plate.

Also, if this scope can be replaced with an 10:1 dual-speed focuser, it could become a more powerful and user-friendly astrograph, but with far lower price. I have an idea of providing any purchasers with all-related information (Including service of ordering the focuser and giving helps on the modification)

Peter
Dear Boss Kwan,

I am interested in this one. Please suggest when you will be around and I can come to visit your office.

Regards,
Tang
Dear Tang sir,
You are welcome to come over, if as quick as today, I am able to be available at office after 6:30pm. But phone me before coming. :)
If tomorrow or after is better for you, I can most of time be available every evening in the following days this week. Please PM me your time. Thank you.
Peter

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