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:

In the shot noise per unit of area, the
FZ50 pixels should outperform all DSLRs at all ISOs.

John, you've stated that your FZ50 performs better in terms of noise for a given absolute exposure at ISO 100 pushed four stops than it does at ISO 1600, which is the reverse of any other camera I know of. It also flies in the face of the notion that the higher ISO amplification tends to reduce noises when referred back to input quantities like photoelectrons. I believe you called it a "Panasonic engineering blooper". Could it be reflective of a problem with the raw data being massaged by the camera at low ISO? If so that would seriously affect your conclusions; for instance, any sort of NR performed before writing the raw data would throw off the inferred sensor efficiency, by making it look more efficient than it is. As it stands, this anomaly in ISO 100 vs 1600 is troublesome, because as I said higher ISO amplification can only improve input-referred noise performance.

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