DPR's noise comparisons.

Started Jul 27, 2013 | Discussions thread
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DPR's noise comparisons.
1

Someone tell me where I'm going wrong with my thinking, or why what I'm thinking is too difficult to do.

  1. Set the scene luminance with a calibrated light meter.
  2. Use a lens that has the same t-stop on all bodies.
  3. Use the same f-ratio, shutter speed, and ISO for both jpg and RAW.
  4. Apply the same tone curve to all RAW conversions.
  5. Halve the scene luminance, increase the ISO setting one stop, keep the f-ratio and shutter speed the same, and repeat through the entire ISO range.

What am I missing?  One possible issue is if there is variance in the shutter speeds between systems.  For example, say that at 1/100, System A is actually 1/90 and System B is actually 1/110.

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