> On Jan 26, 2017, at 11:29 AM, Gonz <[email protected]> wrote: > > Not quite accurate, but close. There is still an amplifier there. > Just multiplying the digital values you get will result in > posterization at the shadow end, its math. You can't create > information out of nothing. If you only have 2 bits of information (4 > values), then the digitization can only result in 4 values, no matter > what you multiply it by. What they mean by ISO invariance is that the > sensors are so good noise-wise that those 4 values will be extremely > consistent (less random/noisy) and will compare favorably with the > amplification by the analog amp. The analog amp will however, result > in many more values, albeit noisy. I.e. the conclusion is you can > take the best pictures by utilizing as much of the histogram as > possible. Its just not realistic to take all your pictures at ISO 100 > and compensate in Lightroom.
Thanks, Gonz. I understand the last two sentences—my problem, not yours. But I will keep them in mind. ------------------------------------------------------------------------------------------ Eric Weir Decatur, GA USA [email protected] (I)t is important that awake people be awake... the darkness around us is deep. - William Stafford -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
