Why only 4.6MP?
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From: nospam on 28 Feb 2010 11:32 In article <MPG.25f46c6edcd8d1e998c23a(a)news.supernews.com>, Alfred Molon <alfred_molon(a)yahoo.com> wrote: > > No, I'm suggesting comparing prints from today's cameras - not a Sigma > > from 2010 versus a Nikon from 2004! > > And what are you trying to prove - that a camera with 12 or 24 MP has > more resolution than a camera with 4.6MP? What a surprise. that's the whole point. a 4.6 mp foveon sensor offers no advantage versus what's currently available. > But coming back to my original question, why on earth is there no Foveon > sensor with 10 or more MP? because it's very difficult (and expensive) to make the sensor, plus that would be a *lot* of data to process which means the camera is going to be far slower than it already is or even more expensive in order to have higher performance processing.
From: Alfred Molon on 28 Feb 2010 14:02 In article <hmdjf1$g7l$1(a)news.eternal-september.org>, david- taylor(a)blueyonder.co.uk.invalid says... > I suggested comparing today's cameras > of similar effective resolution (citing a 4.6MP Foveon and 12MP Bayer as > such cameras) 4.6Mp is not a "similar effective" resolution as a 12MP. A 4.6MP full colour camera has a similar effective resolution of a 7MP bayer camera (rough guesstimate, which obviously depends on the scene photographed). But comparing a 4.6MP (full colour) camera with a 12MP bayer camera does not make much sense. A 10MP full colour camera would be competitive - at least for what concerns the resolution - with the current crop of 12-15MP DSLRs. It would have larger pixels, far fewer aliasing problems and not put such high demands on the optical resolution of the lens and diffraction would be less of a problem, meaning that you could use smaller apertures. -- 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 28 Feb 2010 14:03 In article <280220101132118222%nospam(a)nospam.invalid>, nospam(a)nospam.invalid says... > because it's very difficult (and expensive) to make the sensor That is possible, but how would you know? -- 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 28 Feb 2010 14:43 In article <MPG.25f4dc6a5398567898c23d(a)news.supernews.com>, Alfred Molon <alfred_molon(a)yahoo.com> wrote: > > because it's very difficult (and expensive) to make the sensor > > That is possible, but how would you know? a sensor with three layers is going to be much more complex to manufacture than one with only one layer, not to mention that there isn't the manufacturing volume to keep costs low. also, the thickness of each layer must be held to extremely tight tolerances or there will be a colour shift, and to help address that, foveon has said that *each* camera has to be individually calibrated, adding yet another expense.
From: nospam on 28 Feb 2010 14:43
In article <MPG.25f4dc1d2b7a4fab98c23c(a)news.supernews.com>, Alfred Molon <alfred_molon(a)yahoo.com> wrote: > > I suggested comparing today's cameras > > of similar effective resolution (citing a 4.6MP Foveon and 12MP Bayer as > > such cameras) > > 4.6Mp is not a "similar effective" resolution as a 12MP. right, it's much less. > A 4.6MP full > colour camera has a similar effective resolution of a 7MP bayer camera > (rough guesstimate, which obviously depends on the scene photographed). > But comparing a 4.6MP (full colour) camera with a 12MP bayer camera does > not make much sense. it makes a lot of sense, since competing cameras are 12 mp (and up). > A 10MP full colour camera would be competitive - at least for what > concerns the resolution - with the current crop of 12-15MP DSLRs. maybe, but a 10 mp full colour camera does not exist. by the time one does exist (if ever), bayer will have progressed well beyond 12-15 mp. > It would have larger pixels, but thinner, so noise goes up. > far fewer aliasing problems only if there is an anti-alias filter. sigma omits that, resulting in *more* aliasing. > and not put such > high demands on the optical resolution of the lens and diffraction would > be less of a problem, meaning that you could use smaller apertures. the lens isn't the limiting factor, yet. |