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  Previous versions of alundeb's message #14202075 « Canon - get LOWER ISO SETTINGS! »


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jhg photo wrote:
Yes, I agree that avoiding to fumble around with an ND filter by setting ultralow 12 or 25 ISO would be fine. I don't know, however, whether this could easily be achieved but simply is not done due to missing interst of the photographers or whether this is quite technically demanding.

It is quite technically demanding. The problem is that there is not enough room on the sensor to store the electrical charge that builds up during exposure.

There are a few ways to help slightly, but only slightly.

It could be possible to use more sensor real estate to charge storage versus other critical functions like the photosensitive diode itself, but nobody wants that as it would severly impact the sensitivity and noise.

It is possible to make physically deeper wells, like in the EXMOR generation used in the Nikon D810, or with BSI/Stacked sensors like in the D850. This wil give about 2/3 stops lower ISO, without any clear disadvantage.

It is also possible to make the color filter denser. That will also imact sensitivity and noise, but part of the impact will be compensated by the better color sensitivity that will require less amplification of the color channels and hence less amplification of noise in the image. The new PhaseOne Trichomatic sensor does this, and this gives ISO 35 compared to 50 for nornal color filter PhaseOne backs with the same underlying sensor. Before the 5DS was released, there were rumors that it would do the same, but it turned out not to be the case.

Oct 02, 2017 at 07:55 AM

  Previous versions of alundeb's message #14202075 « Canon - get LOWER ISO SETTINGS! »