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Old Feb 5, 2003, 10:08 AM   #11
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NHL...It's worse than I thought then. We all understand and hate digital zoom, ASA is digital sensitivity!

From this link:


Comes this quote:

I have looked into the data contained in RAW files taken using "manual exposure control" and "manual ISO" settings 100, 200, 400 and 800. It appears to me that Minolta are not simply binary bit shifting the 12 bit A/D one bit left as ISO is doubled.

It appears that the 12 bit A/D data is multiplied by a fractional value, and these values appear to be as follows...
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Old Feb 5, 2003, 10:55 AM   #12
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Yea, i've read it and also if you look at most of the A/D that interfaced to the Sony HAD CCD are actually 14-bit and after the shifting, one ends up with the normal 12-bit.

The other thing is that shutter speed is a function of how long each CCD pixel is allowed to charge up. ie fully charge up is the optimum. What about the faster speed? It looks to me like there's only one optimum point, ie too long and the CCD will saturate while too short the signal to noise will be terrible!

Check this out also:http://www.eetimes.com/sys/uth/OEG20030127S0053
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