This post was last modified: 2018-01-12, 13:07 by
Gunther.
Holy Grail Wizard and the 2*/3* keyframes are only needed for sequences shot in M Mode. And yes, of course it will detect changes in Exposure (as well as ISO and Aperture).
There are many reasons to shoot timelapse in M and ramp Shutter/ISO/Ap independently from the camera automatic modes - preferably with a ramping solution like qDslrDashboard. This will give you the maximum control about the values (for example go for longer exposure times, have aperture only ramping in a certain range etc.). So this workflow with the holy grail wizard is streamlined to work with M mode. The Holy Grail Wizard only uses the exif-Data of the images to calculate the compensations. This leades to a good result that will further be refined with the visual deflicker.
Of course, you can shoot your timelapse in A mode as well - then you won't need the holy grail wizard, that's why it's grayed out. The reason is, that most of the cameras do smooth transitions for exposure/iso/aperture in A mode that means, they don't only use the defined values that you can set on the camera, but inbetween values too. But they write the (rounded) defined values into the exif data leading to a difference in the capured brightness vs. the recorded exif-data.
Since LRTimelapse's Holy Grail Wizard uses Exif-Data to calculate the compensations, this would lead to quite the opposite effect in this scenario: meaning the Holy Grail wizard would introduce steps instead of removing them. That's why Holy Grail Wizard is not useful for sequences shot in A-Mode.
This is where the 2nd powerful tool of LRTimelapse comes into play: the visual deflicker. If you shoot in A Mode, just use the visual deflicker and ignore the holy grail wizard.