Why only 4.6MP?
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From: Alfred Molon on 1 Mar 2010 14:30 In article <010320101204169264%nospam(a)nospam.invalid>, nospam(a)nospam.invalid says... > dpreview lists the dp1 as resolving 1500-1525 lines: > <http://www.dpreview.com/reviews/sigmadp1/page19.asp> > they list the 6mp nikon d70 at 1450-1600 lines, a little wider range > but basically the same: > <http://www.dpreview.com/reviews/nikond70/page26.asp> > and the 8mp canon 350d at 1650-1850 lines and the 10 mp nikon d80 at > 1800-2200 lines > <http://www.dpreview.com/reviews/nikond80/page28.asp> These resolution tests are rather meaningless, because they were performed with black and white test targets. -- 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 1 Mar 2010 14:32 In article <010320100310484995%nospam(a)nospam.invalid>, nospam(a)nospam.invalid says... > > > the lens isn't the limiting factor, yet. > > > > Yes it is when you have 18MP in an APS-C sensor. > > nope, but even if it was, foveon is stuck at 4.6, so the lens is not > the limit. But it's the limiting factor for an 18MP APS-C DSLR. Not that many lenses around which are good enough for such a camera. -- 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 1 Mar 2010 14:35 In article <XMTin.38825$K81.16877(a)newsfe18.iad>, |||newspam|||@nezumi.demon.co.uk says... > I would actually be interested to see if the Foveon can beat the 8Mpixel > clasic Bayer CCD. Quite unlikely with just 4.6MP. -- Alfred Molon ------------------------------ Olympus E-series DSLRs and micro 4/3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site
From: Bruce on 1 Mar 2010 14:38 On Mon, 1 Mar 2010 20:26:48 +0100, Alfred Molon <alfred_molon(a)yahoo.com> wrote: >In article <hmfrir$o9c$1(a)news.eternal-september.org>, david- >taylor(a)blueyonder.co.uk.invalid says... >> >> False, if the low-pass filter does the correct job for Bayer pixels. > > >Did you even read what I wrote? Your reply has no connection at all with >my post. David likes the sound of his own voice. He purports to have some detailed high level knowledge of the workings of digital sensors. However, his only relevant experience was gained using a low-end Nikon DSLR and a consumer grade zoom lens. As a result, his signal/noise ratio is very low indeed, approximating to that of an average wasp.
From: nospam on 1 Mar 2010 14:57
In article <MPG.25f632e1d786104398c242(a)news.supernews.com>, Alfred Molon <alfred_molon(a)yahoo.com> wrote: > > yes, but the foveon has an *additional* need to keep the three layers > > consistent. > > You are making some assumptions about things you do not know. There > could very well be no additional step. it's obvious that the layers need to be the same thickness across the entire surface of the sensor, otherwise the colour response would vary, depending on which part of the image. that's why they have to calibrate every single camera. bayer has no such problem. |