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Old Jul 21, 2020, 7:18 PM   #1
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Default iso and cmos sensor

Hi all,
As some of you know I bought a Canon SX240. As a rule I install CHDK on my Canon cameras in order to (among other things) be able to lower the iso beyond what the 'out of the box' camera allows. The SX240 has a CMOS sensor. My question is .... is the CMOS sensor as sensitive to iso changes (primarily low ones) as the CCD sensor is?
Thanks,
...... john

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Old Jul 21, 2020, 8:56 PM   #2
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Try it.
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Old Jul 21, 2020, 9:33 PM   #3
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Right ....... got it.
...... john
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Old Jul 22, 2020, 4:33 AM   #4
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Let us know how it turns out.
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Old Jul 22, 2020, 1:33 PM   #5
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Quote:
Originally Posted by TCav View Post
Let us know how it turns out.
Hi TCav,
I don't intend to do a comparison, so I won't likely be able to report on their differences.
I will, in time however, get a feel for whether the SX240 reacts to low iso as my CCD sensor cameras, in the sense of providing more atmosphere and being more forgiving wrt to lightening darker areas, noise wise. I know that 'more atmosphere' is a very nebulous term, but I feel that lowering iso to 50 or 60 seems to provide a more pleasing photo in many cases. It may be a purely noise related phenomenon. I'm sorry, I can't describe it any better.
In film, what differences does low iso do to the image?
........ john
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Old Jul 22, 2020, 5:35 PM   #6
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G'day John
Film ... well it was the grains of silver halide that changed colour / tone so that we could see the image. The larger the grains the more sensitive the emulsion

So many people chose "fine grain" films ie- those below 100-ISO and also use "fine grain" developers which were more delicate (for want of a better term)

Colour films had 3 layers of emulsion holding the grains of silver halide - thus their "grain response" was more visible than single-layer, monochrome / B&W films

Hope this helps
Phil
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Old Jul 22, 2020, 9:20 PM   #7
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Hi Phil,
Thanks. I had no idea that's how film worked. Very interesting.
...... john
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