On 25/08/07, Toralf Lund <[EMAIL PROTECTED]> wrote: > In any case, doesn't the real point still remain? Doesn't a lower native > ISO mean that you have to amplify the data more at a given higher ISO > setting? If it does, asking for a lower ISO is in reality asking for > more noise at higher ISO values, since when you amplify the data, you > also amplify the noise...
Yes for a lower base ISO the system would have to apply more amplification to reach a higher ISO. But considering ISO and predicting noise performance without considering the systems latitude is impossible. For instance if a small sensor of 200ISO base sensitivity and 4 stop latitude (let's say a mobile phone cam) is amplified to acheive an equivalent ISO800 sensitivity vs a sensor with an 100ISO base sensitivity but 8 stop latitude (poor DSLR) pushed to ISO800 discounting pixel count which sensor do you think will have the best SNR at ISO800? -- Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://picasaweb.google.com/distudio/PESO http://home.swiftdsl.com.au/~distudio//publications/ Pentax user since 1986, PDMLer since 1998 -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
