Reply to thread

Message: <blockquote data-quote="pforsell" data-source="post: 493087" data-attributes="member: 7240">D7200 ISO range is 100 to 25600 plus hi-modes up to 102,500 (Hi +2.0).D750, D3S, D4, D4S and DF all go to at least ISO 12,800 plus hi-modes up to 409,600 and some have lo-modes down to ISO 50 (Lo -1.0)The extended ISO values without a number, designated just as Hi +x.x or Lo -x.x are emergency modes for situations where even a very bad image is better than no image. Think of meeting the Jeti in starlight with no moon. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek!    :eek:" loading="lazy" data-shortname=":eek:" /> In the hi-modes in Nikon cameras the signal from the sensor is "amplified"* only digitally, meaning that the raw data numbers are just multiplied. These modes are useful only for the jpeg shooter, since every raw developer software can adjust image brightness in processing with an "exposure" slider or some similar control anyway.This next part will cause controversy in web forums. There's not enough time nor room right now to go to the bottom of the issue, but I'll just say it anyway. We can continue this later, if you wish.Raising ISO does not increase noise in any of Nikon DSLR cameras. On the contrary, raising ISO decreases noise. There are two outlier cameras, D2X(s) and D7000, which are almost ISOless meaning that the ISO setting does not actually affect image quality and noise at all. All the rest behave as I wrote in the bolded section above. * it is not amplified, it is just scaled, but I used the incorrect word to emphasize what's happening</blockquote>

Verification