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#21
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No P&S for a serious hobbyist?
Nobody is saying the there are no physical limitations, only that the
cameras are nowhere near them. What is being offered or withheld is governed not by physics but marketing decisions. The 35 mm film cameras had a bigger "sensor", the film itself, than any digital ps. Lenses, zooming, etc. are not affected by whether the image is recorded in analog or digital format. |
#22
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No P&S for a serious hobbyist?
Dennis Gnad wrote:
With a bigger sensor you can then push up the ISO, and it will be less noisy. Of course the lens will let less light through. So in the end you might have the same, if there wasn't diffraction. The trouble is, ISO rating is not a free parameter: It's a property of the sensor, I think roughly it's the ratio of quantum efficiency and dark current with some fudge factors added to make the numbers comparable to the old ASA film speed ratings. And I also think the factor of the lens letting light through depending on the image circle is not directly proportional to a sensor being more or less sensitive to light and being more/less noisy depending on the image circle it can capture. I think that it behaves more exponential at sensor size, but linear in lens size? I'm not sure at all, but to my observation it looks like that (at least as a rule of thumb). I'll admit I didn't follow those two paragraphs..... So, I think, a bigger and more sensitive sensor and slower (letting less light through) lens will be a better combination than a fast lens and small sensor. (also because of the diffraction, and yes pinholes can suffer from diffraction, but if you have a larger format camera it will be less) A bigger sensor will also contribute more noise (dark current) so making it bigger becomes a losing game after a point where it catches most of the light the lens puts on it. One of the tricks is that the sensor surface is not all active; a bigger sensor can have a higher percentage of active area, that may be what you're thinking of: For a given number of pixels, active area goes up as the sensor grows, but as the pixels grow so does the noise. In a noiseless detector you might be correct, but then you'd be lugging a Dewar of liquid nitrogen around to top up your camera 8-) The pictures, however, would be very good, especially the night shots. bob prohaska |
#23
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No P&S for a serious hobbyist?
RPS wrote: Nobody is saying the there are no physical limitations, only that the cameras are nowhere near them. What is being offered or withheld is governed not by physics but marketing decisions. The 35 mm film cameras had a bigger "sensor", the film itself, than any digital ps. Lenses, zooming, etc. are not affected by whether the image is recorded in analog or digital format. I have long argued that digital photography is in its infancy. I have tons of Kodachrome 25 tranparancies that I shot with my old, (well I still have it if I want to get serious), Leica M2. I have a few scans and believe me, they are the standouts in my screen saver. Additionally, the tonal range is far greater and I get great detail even when shooting into the sun late in the afternoon. OTOH, nothing beats the convenience of digital and the cost is far less when you can simply erase and reshoot... JT |
#24
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No P&S for a serious hobbyist?
Canon SD 800IS.
Just bought one 3 weeks ago and I am ready to sell off all my other gear. Greta little camera with a 28mm FOV on the wide side, optical stabilization, and great picture quality. You can find it under $300 now. -- © Johnny Slothman Slowest Contractor In The West If you need it done 10 years from now, call Johnny |
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