Sigma/Foveon Questions
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From: Alfred Molon on 24 Apr 2010 19:18 In article <240420101601373022%nospam(a)nospam.invalid>, nospam says... > > If what you say is correct, Alfred, what they were saying is also correct, > > and in accordance with the physics of the situation. Less sensitive area > > captures fewer photons, which means more noise. Today, improved > > micro-lenses and higher QE may well have offset the reduced sensing area. > > people did say that live view would impact the noise levels, but the > missing piece is that sensor technology advanced which offsets any > loss. If it were true that live view increases the noise levels, Nikon would have never introduced it into the D3, which was designed to be the high ISO champion. Nikon would never had done anything which would have compromised noise performance in the D3. Even the D3s with ISO up to 102400 has live view. But the point simply is that while it may seem logical that live view circuitry reduces the light sensitive area, in reality it appears that the implementation is such that live view does not impact the high ISO performance. In any case, this is something that only a sensor designer with in-depth knowledge can comment on. All these discussions about what a sensor can do or not are meaningless, if they are held by people who don't have sufficient information. -- 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: Alfred Molon on 24 Apr 2010 19:22 In article <240420101559365787%nospam(a)nospam.invalid>, nospam says... > however, the total number doesn't change. there are 12 million on the > sensor and 12 million in the image, or however many the sensor has. There are 12 million one-colour pixels which get magically transformed into 12 million full-colour pixels. 2/3 of the needed colour information is missing in a Bayer sensor, and that has an impact on the effective resolution. -- 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: nospam on 24 Apr 2010 19:24 In article <MPG.263d9b86d8754bb98c2ae(a)news.supernews.com>, Alfred Molon <alfred_molon(a)yahoo.com> wrote: > 2/3 of the needed colour information is missing in a Bayer sensor, and > that has an impact on the effective resolution. a small impact.
From: nospam on 24 Apr 2010 19:27 In article <MPG.263d9a9681f5dfb498c2ad(a)news.supernews.com>, Alfred Molon <alfred_molon(a)yahoo.com> wrote: > > > If what you say is correct, Alfred, what they were saying is also > > > correct, > > > and in accordance with the physics of the situation. Less sensitive area > > > captures fewer photons, which means more noise. Today, improved > > > micro-lenses and higher QE may well have offset the reduced sensing area. > > > > people did say that live view would impact the noise levels, but the > > missing piece is that sensor technology advanced which offsets any > > loss. > > If it were true that live view increases the noise levels, Nikon would > have never introduced it into the D3, which was designed to be the high > ISO champion. Nikon would never had done anything which would have > compromised noise performance in the D3. > Even the D3s with ISO up to 102400 has live view. even with live view, the d3 sensor is much better than previous sensors and customers want live view. > But the point simply is that while it may seem logical that live view > circuitry reduces the light sensitive area, in reality it appears that > the implementation is such that live view does not impact the high ISO > performance. In any case, this is something that only a sensor designer > with in-depth knowledge can comment on. do you have a d3 sensor without live view to compare with one that has live view? no? then how do you know that it does not impact anything?
From: David J Taylor on 25 Apr 2010 02:24
> however, the total number doesn't change. there are 12 million on the > sensor and 12 million in the image, or however many the sensor has. There are 12 million monochrome pixels on the sensor, interpolated to 12 million colour pixels. The sensor only has 3 million red pixels, but there are 12 million red values in the final image. Created by spatial interpolation. Same for blue pixels. With green, typically 6 million are interpolated to 12 million. Cheers, David |