Is the canon's marketed iso value really fake??? - page 2 - General Chat - CHDK Forum  

Is the canon's marketed iso value really fake???

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Re: Is the canon's marketed iso value really fake???
« Reply #10 on: 11 / April / 2008, 11:35:34 »
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Hi,

I am mystified why Canon would not have very precise control over ISO, shutter and aperture.  These are, after all, digital cameras.  Can the camera check on the progress of an exposure during the exposure?  Could it be possible that they vary the ISO (within limits) during an exposure to get better results?

Re: Is the canon's marketed iso value really fake???
« Reply #11 on: 11 / April / 2008, 16:46:56 »
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« Last Edit: 22 / April / 2008, 15:20:25 by Barney Fife »
[acseven/admin commented out: please refrain from more direct offensive language to any user. FW complaints to me] I felt it imperative to withdraw my TOTAL participation. Nobody has my permission, nor the right, to reinstate MY posts. Make-do with my quoted text in others' replies only. Bye

Re: Is the canon's marketed iso value really fake???
« Reply #12 on: 11 / April / 2008, 17:46:51 »
Did that help?

Yes, to summarize:
1.  The common aperture and shutter settings found on cameras were created long ago and are retained for historical reasons, but the actual values used in an exposure are only approximations to the camera settings.

2.  For ISO Canon reports only very crude approximations to the actual ISO used.  You feel that this is for marketing reasons.  I would comment that in fact very few Canon P&S users know or care about ISO, especially low ISO.  ISO is nowhere near as important as a buzz word as Megapixels.  Mainly highest ISO is touted so that users can take pictures indoors in low light. 

The lowest ISO on a camera is important to me since noise is a very big issue for my work and I usually set the camera to the lowest available ISO.  Thus I look for a camera with highest lowest ISO, but I doubt that many others are conscious of lowest ISO.  A problem for me is that there is no standard for noise level at lowest ISO.  So a camera with a high lowest ISO may not produce as low a noise level as I might want.  I am interested in seeing if CHDK can produce lower noise images than the camera's lowest ISO setting.

Thanks for making it clear. 
« Last Edit: 11 / April / 2008, 18:01:54 by hiker_jon »

Re: Is the canon's marketed iso value really fake???
« Reply #13 on: 11 / April / 2008, 18:22:18 »
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« Last Edit: 22 / April / 2008, 15:20:44 by Barney Fife »
[acseven/admin commented out: please refrain from more direct offensive language to any user. FW complaints to me] I felt it imperative to withdraw my TOTAL participation. Nobody has my permission, nor the right, to reinstate MY posts. Make-do with my quoted text in others' replies only. Bye


 

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