Why should dynamic range be lower when using ES?!The best part of contributing data to this is finding out the results! Very very cool to see that the ES is very, very close to the mechanical shutter. That matches my real-world experience with shooting in ES, where I haven't noticed notable differences in dynamic range. ISO 100 Electronic shutter has more dynamic range than ISO 159 mechanical shutter, this is really not a difference I'm all that worried about whatsoever.
This is a camera I am totally happy to leave in ES and never click the physical shutter once. Excellent all around.
This is a question for someone with far more technical knowledge than I have, but I believe from past things I've read, the reason for it is that without the mechanical shutter closing after each exposure, stray light can impact the image following the exposure, introducing slightly more read noise. That's why you see the option for "Electronic First Curtain shutter," which still has a secondary mechanical shutter, and does not impact DR at all. That way, with the mechanical shutter closed, there is no additional light to generate read noise/heat on the sensor circuits for the brief milliseconds it takes to process the exposure.
Most implementations of electronic shutter we've seen so far use 12 bit instead of 14 bit to increase the sensor read speed. Or reduce rolling shutter if you prefer.
Reading pixels in electronic shutter (ES) mode has more noise than in mechanical shutter (MS) mode therefore dynamic range is reduced.
I wish there was a better way to quantify the effect of signal processing but I have not found one.Is anyone able to quantify the noise reduction on the R5 ? And in time the R3 which looks like it uses it all the way up the ISO. Kind of jars a bit with me; I can't understand a 24 mp sensor having the same high ISO with NR applied as a 45mp one without ? Given equal generations.
Bill Claff himself suggested around two thirds of a stop. Is it possible to achieve the same improvement in DR through noise reduction in post ?