Nikon Z6, Z7 and Canon EOS R low-light ISO scores?

Started Dec 4, 2018 | Discussions thread
John Sheehy Forum Pro • Posts: 24,183
Re: Nikon Z6, Z7 and Canon EOS R low-light ISO scores?

camera_nerd wrote:

Photonstophotos has a chart that is much more accurate than DxO.

See here http://www.photonstophotos.net/Charts/PDR.htm.

I have Canon, Sony, Fuji, Olympus, and Panasonic cameras and just sold my Nikon

DSLRs. My experience agrees with Photontophotos.

That would make sense, if you both ignored absolute exposure.

PDR is not a measurement of input-referred noise. It is a an SNR threshold measured below the assumed (4095, 16383, etc; not measured) clipping point, of unstated exposure level.

If Canon made "HTP" standard, and removed the non-HTP versions of ISOs, the PDR would increase by almost a stop for all the high ISOs, but noise would go a hair up, not a stop minus a hair down! There are cameras by other manufacturers that do just that; they start with an ISO 200 with lots of headroom and maintain it throughut the ISO scale; this increases PDR, but does not decrease noise when you shoot at 1/800 at f/8 in a given situation.

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