Date: Mon, 17 Nov 03 10:36:54 +0000 From: Bob Marchant <[EMAIL PROTECTED]> Subject: Re: [PRODIG] MF digital v Nikon question for Bob Marchant........
>From Ian Jebbett Just caught up with these topics after a few days away and hope I'm not too late to contribute! ............>>>>If the backs that you mentioned in your original reply have a nominal >> ISO of 50-100 there is no way you could move the curve enough to >> equate to 1250 ISO or worse so I still feel my original comment was ...........>>> Adjustment of 3+ stops is not out of this world and very recoverable in APS - although I guess the inherent quality of the chip is a prime factor for how much image data can be reclaimed under more extreme circumstances. >>>>>If the D100 chip is truly more sensitive while maintaining the same dynamic range and noise in comparison to high end backs , then I'll be pleased to see the results and wonder why the manufacturers of high end systems haven't adopted this technology. How exactly does the D100 provide this change of ASA ?>>>> I'm a bit non-plussed with the idea that all CCD chips have only one sensitivity! My understanding (in the case of Nikon CCD's) is that when the ISO setting is changed using the 'ISO film speed' selection dial, the POWER to the chip is reduced or increased, the CCD status changes depending on the ISO selected and the data from the exposure is processed in the same way regardless of the ISO setting used. This may or may not be the case with other sensors or backs and only the manufacturers will be able to give a definitive answer, but in-camera software carrying out 'curve adjustments', especially when RAW image files are being created at different ISO settings seems to defeat the object of RAW files! Ian[at]foto-works.net www.foto-works.net Creative Digital Photo-Graphics t 01239 831818 m 07941415610 My out-going text and images are Virus Checked =============================================================== GO TO http://www.prodig.org for ~ GUIDELINES ~ un/SUBSCRIBING ~ ITEMS for SALE
