Exposure control in a raw developer: misnomer?

Started Jan 30, 2013 | Discussions thread
OP dosdan Regular Member • Posts: 497
Re: Absolutely correct.

The answer is yes, they are the same exposure. QE is not part of it. It's the photons falling on the unit area of the sensor that are the same, not the photo-electronics produced. Since only scene luminance, shutter speed and f-number are involved with determining the amount of light/unit area arriving, for the same scene luminance, f/5.6 & 1/100s results in the same exposure on APS-C AA-less, FF Foveon & MF cameras. (Assuming the same lens transmittance.)

So while I use the phrase "photons captured" (OK if considering different settings on the same camera), exposure is really about "photons arriving" rather than"photons converted".

In the two exposures with different shot noise figures, I was assuming the same camera.


For many, "exposure" = "brightness". Here's another conundrum for you: does f/2.8 1/100 ISO 1600 on a 5D have the same exposure as f/2.8 1/100 ISO 1600 on a 6D? After all, the noise is most certainly not the same.

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