Quote:
Originally Posted by fletch
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)
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Thanks for catching that, fletch -- I'm slow on the reply. I agree with the above.
It's worth saying that your exposure can change
very quickly especially in odd lighting situations. I was shooting at a waterfall recently, with a number of interesting ND filters, and my maximum exposure length would vary from 1 to 5 seconds based just on slight changes in my position. That's because I was working at 200 mm, and the frame really would change that much. So I wouldn't be surprised if the OP and the curiously misguided fellow next to him really just had a similar difference.