[請教] 單色機用顏色濾鏡

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[請教] 單色機用顏色濾鏡

文章 鄧登凳 » 週四 16 2月, 2012 16:10

請教:

1. LRGB 中的 L-濾鏡, 和clear濾鏡有何分別?

2. LRGB 中的 R, G 和 B, 與photometric UVBRI中的R, V和 B有何分別?

[跪拜禮]

PTS
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Re: [請教] 單色機用顏色濾鏡

文章 PTS » 週四 16 2月, 2012 20:18

鄧登凳 寫:請教:

1. LRGB 中的 L-濾鏡, 和clear濾鏡有何分別?

2. LRGB 中的 R, G 和 B, 與photometric UVBRI中的R, V和 B有何分別?

[跪拜禮]
for (2):
the RGB in LRGB is NOT well defined in terms of bandwidth nor central wavelength.
For the UVBRI in photmetric systems, there are more than one system - Johnson, Landolt, etc. Each system is well defined ib the choice of glass and emulsion combinations.

Please see:
http://spiff.rit.edu/classes/phys445/le ... olors.html


pts

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Re: [請教] 單色機用顏色濾鏡

文章 鄧登凳 » 週四 16 2月, 2012 21:39

PTS 寫: for (2):
the RGB in LRGB is NOT well defined in terms of bandwidth nor central wavelength.
For the UVBRI in photmetric systems, there are more than one system - Johnson, Landolt, etc. Each system is well defined ib the choice of glass and emulsion combinations.

Please see:
http://spiff.rit.edu/classes/phys445/le ... olors.html


pts
Thank PTS for the useful information and web-link.

May I assume that R, V and B filters in most UVBRI systems can be used as R, G and B filters in LRGB astrophotography?

PTS
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Re: [請教] 單色機用顏色濾鏡

文章 PTS » 週四 16 2月, 2012 21:48

Thank PTS for the useful information and web-link.

May I assume that R, V and B filters in most UVBRI systems can be used as R, G and B filters in LRGB astrophotography?[/quote]

For photographic purposes, the RGB are just for adding colour tinges to the image. These images surely cannot be used for quantitative work. The L exposure should dominate. Thus, any filter will do. However, the RVB in photometric systems are surely different from the photographic RGB filter, and you have to adjust the "weight" of each colour when you make the final colour image.

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文章 鄧登凳 » 週五 17 2月, 2012 10:28

Dear PTS,

Thank you very much.

Regards,
Tang

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