Quote:
Originally Posted by auto-focus
David, I'm not sure, but I think we're somewhat in agreement. If both cameras have the capability of ISO 100 available to them, and both shooting in the same ambient light conditions, but because of less high end electronics in one camera it may need to bump the ISO up to 200 in order to accomplish the correct end result. Whereas, the camera with higher end electronics can yield the same result at 100 ISO...and I know there will be some differences in the F/Stop and shutter speeds between the two. When I say higher end electronics, I'm speaking of improvements in CCD, or CMOS sensor technology, faster and higher resolution A/D processors, larger and higher speed buffers (RAM), and higher performing Digital Signal Processors. I sell this crap (industrial electronics) for a living, and like teaching for yourself, this is how I make my living.
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No - No - No. If you tried to sell me some of this
crap I'd be off like a shot.
ISO is ISO is ISO (Taking into account calibration) just like f/4 is f/4 is f/4
The most likely cause of the different ISOs used in the original question is that the OP and the other photographer ended up with
different prictures. Either the ISO 200 shot was darker or the pictures had different compositions so the amount of light was different.
The size of the sensor of the cameras electornics won't affect the ISO you need to shoot at. All of the calibration will be done in camera. Sure a D3 can shoot higher ISOs than a D40 but if you shoot at ISO 200 with both cameras (with the same aperture and shutter speed) you will get the same exposure, it would even be the same if you went and tried a 5 year old Sony P&S camera. ISO 200 would still be ISO 200. End of, it really is that simple.
(Yes calibration may be off in some cameras but that is an unnecessary confusion IMO)