Exposure compensation in tethered shooting- possible?

Software darktable
1

I am trying darktable tethered shooting for DSLR scanning (from slides), using a Nikon D610. I’m impressed with the extent to which I can control exposure (aperture, shutter speed, ISO) from dt, as well as being able to control the brightness of the illumination. What I don’t seem to have is an exposure compensation setting facility as when shooting non-tethered. Is there a control for this? The manual implies ‘no’.

I’m also somewhat confused about the brightness of the live-view image I get: this does not seem to alter when I use any of the exposure adjustment controls. Does this suggest I have not set up the tethering correctly?

In tethered mode is the camera doing automatic exposure control in some way so that the live view always has the same appearnce?

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What you can set is (also) determined by the library used to implement the tethering (e.g. gphoto2).

Quite possible, it’s what happens in cameras with an electronic view finder.

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3

The D610 has an optical pentaprism viewfinder.