Backlit sensors
in [Digital Cameras]
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From: Alfred Molon on 7 Mar 2010 04:47 In article <hmucu8$eke$1(a)news.eternal-september.org>, paul-@- edgehill.net says... > http://www.dpreview.com/news/0908/09080601sonycmos.asp > "However, compared to conventional front-illuminated structures, > back-illuminated structures commonly causes problems such as noise, dark > current, defective pixels and color mixture that lead to image > degradation and also cause a decrease in the signal-to-noise ratio." Strange. The ability to capture more light should lead to less noise, not more. -- Alfred Molon ------------------------------ Olympus E-series DSLRs and micro 4/3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site
From: David J Taylor on 7 Mar 2010 06:02 "Alfred Molon" <alfred_molon(a)yahoo.com> wrote in message news:MPG.25fd9454a5c06a5d98c24f(a)news.supernews.com... > In article <hmucu8$eke$1(a)news.eternal-september.org>, paul-@- > edgehill.net says... >> http://www.dpreview.com/news/0908/09080601sonycmos.asp >> "However, compared to conventional front-illuminated structures, >> back-illuminated structures commonly causes problems such as noise, >> dark >> current, defective pixels and color mixture that lead to image >> degradation and also cause a decrease in the signal-to-noise ratio." > > Strange. The ability to capture more light should lead to less noise, > not more. Yes. more light, but other problems caused by back-illumination, so there's a trade-off point where the problems caused by back-lighting are less than than the gains, and when that's reached, backlit sensors become a better choice. I think we saw something similar as CCD has been gradually replaced by CMOS. Cheers, David
From: Alfred Molon on 7 Mar 2010 12:47 In article <hn013e$1f7$1(a)news.eternal-september.org>, david- taylor(a)blueyonder.co.uk.invalid says... > Yes. more light, but other problems caused by back-illumination, so > there's a trade-off point where the problems caused by back-lighting are > less than than the gains, and when that's reached, backlit sensors become > a better choice. What other problems are you referring to? -- Alfred Molon ------------------------------ Olympus E-series DSLRs and micro 4/3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site
From: David J Taylor on 7 Mar 2010 15:29 "Alfred Molon" <alfred_molon(a)yahoo.com> wrote in message news:MPG.25fe0534be243f9e98c250(a)news.supernews.com... > In article <hn013e$1f7$1(a)news.eternal-september.org>, david- > taylor(a)blueyonder.co.uk.invalid says... > >> Yes. more light, but other problems caused by back-illumination, so >> there's a trade-off point where the problems caused by back-lighting >> are >> less than than the gains, and when that's reached, backlit sensors >> become >> a better choice. > > What other problems are you referring to? > -- > > Alfred Molon The ones you originally referred to in: http://www.dpreview.com/news/0908/09080601sonycmos.asp David
From: Pete D on 7 Mar 2010 17:39
"David J Taylor" <david-taylor(a)blueyonder.co.uk.invalid> wrote in message news:hn013e$1f7$1(a)news.eternal-september.org... > "Alfred Molon" <alfred_molon(a)yahoo.com> wrote in message > news:MPG.25fd9454a5c06a5d98c24f(a)news.supernews.com... >> In article <hmucu8$eke$1(a)news.eternal-september.org>, paul-@- >> edgehill.net says... >>> http://www.dpreview.com/news/0908/09080601sonycmos.asp >>> "However, compared to conventional front-illuminated structures, >>> back-illuminated structures commonly causes problems such as noise, dark >>> current, defective pixels and color mixture that lead to image >>> degradation and also cause a decrease in the signal-to-noise ratio." >> >> Strange. The ability to capture more light should lead to less noise, >> not more. > > Yes. more light, but other problems caused by back-illumination, so > there's a trade-off point where the problems caused by back-lighting are > less than than the gains, and when that's reached, backlit sensors become > a better choice. Surprisingling though some the best low noise cameras at the moment are still CCD. I think we saw something similar as CCD has been > gradually replaced by CMOS. > > Cheers, > David |