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Canon EOS Ra Sensor Measurements at PhotonsToPhotos

Started Aug 13, 2020 | Discussions thread
OP bclaff Forum Pro • Posts: 13,922
Re: Canon EOS Ra Sensor Measurements at PhotonsToPhotos

EthanCam wrote:

Very interesting, thanks for running the numbers, and thanks also to GXAlan for running the tests

I am intrigued by the lower read noise of the EOS Ra w.r.t. to EOS R / 5DIV at base ISO.

Assuming only the optical low-pass filter was changed, this should not change the read noise (in e-) in dark frames in my understanding. So here my questions:

  • Have you spotted some kind of 'NR' in the dark frames of the EOS Ra, like for the R5?
  • Or is it because the camera can use a lower conversion gain (e- to DN) due to increased sensitivity in the reds? (I would think this is the more likely explanation)

No NR spotted but since more photons are captured you would need to lower the conversion gain to avoid clipping the ADC and that would result in slightly lower noise.
So that's a good theory.

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Bill ( Your trusted source for independent sensor data at PhotonsToPhotos )

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