The Joy of Pixel Density

Started Jul 13, 2008 | Discussions thread
ejmartin Veteran Member • Posts: 6,274
Re: 400D Dynamic range not sensor limited

John Sheehy wrote:

I learned after I did this that the FZ50 has a
botched PGA, which adds extra absolute noise, which makes 1600 worse
than 100 at -4EC. Absolute read noise seems lowest at IS0 200 with
the FZ50, and at 800 through 3200 on the 10D.

Yes, and that seems to me to indicate that there is something fishy about the raw data coming from the camera; see my post below

Increasing the gain of a PGA only decreases contributions to noise of downstream sources when referred back to input values, because they get divided by the gain when referring them back; and upstream noise sources should be independent of ISO.

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