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tslussc
註冊: 2007-03-23
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CCD size Post time: 5 月 7 日 |
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本人是新手, 問如果只需五百萬像素相(已够曬A4相)的DC,下面那一個CCD較好(已知CCD較大的好而1/1.8比1/2.5大)
CCD size 1/1.8 - 1千萬像
CCD size 1/2.5 - 7百萬像
如果是同牌子,我覺得1/2.5 - 7百萬像反而可能較好, 較小noise? 是嗎? 請指教!
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fredrace
註冊: 2007-05-10
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Re: CCD size Post time: 5 月 11 日 |
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1/2.5 and 1/1.8 are talking about diagonal length, so the ratio in area of 1/2.5 and 1/1.8 CCD is (1/2.5 x 1/2.5) : (1/1.8 x 1/1.8) = 1:1.929, means 10M pixel in an area of 1.929 times of that for 7M, density is lower, noise should be lower, hope this can help
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fredrace
註冊: 2007-05-10
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Re: CCD size Post time: 5 月 11 日 |
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I would like to say sorry to those being mis-lead by my last reply.
Refer to information, actual size of 1/1.8 CCD is 7.176 x 5.319 mm2 and of 1/2.5 CCD is 5.760 x 4.290 mm2, actual ratio in area of 1/2.5 and 1.1.8 CCD are (7.176 x 5.319) : (5.760 x 4.290) = 1.545. So 10M 1/1.8 CCD has a slightly lower density comparing with 7M 1/2.5 CCD.
Please check below information for detail:
http://www.dpreview.com/learn/?/Glossary/Camera_System/sensor_sizes_01.htm
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