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Message: <blockquote data-quote="Horoscope Fish" data-source="post: 693596" data-attributes="member: 13090">While I don't know if manufacturers fudge the numbers or not, I long ago came to the understanding that ISO is not part of exposure (only aperture and shutter speed do that), that digital noise is not the same thing as (film) grain but rather a side effect of the SNR and so forth. This of course upends the whole "Exposure Triangle" paradigm/apple cart, however, which in turn tends to upset many people in photography circles (based on my experience, anyway) in general so I've quit talking about it. I agree wholeheartedly what is now being called ISO should be rebranded as "Gain" because 1) it's the far more accurate term and, 2) gain can be measured objectively and thusly could be standardized absolutely.</blockquote>