Ok, so, in my last post I said I'd avoid the field monitor.
Boy, did I forget that I had an ebay sniper set up for some already?
So, I got a ESDDI F5 monitor (5inch, fhd, can receive 4k signal). And last night there were favourable conditions for Aurora Borealis in my location.
And I am happy to report that the monitor helped me get the focus spot on! At least far better than I would have been able to.
I switch the camera to video mode (hdmi otuputs 4k in video and playback modes, fhd in photo mode), found a star, zoomed in on the focus point and then zoomed in on the display itself a few times. When the focus was reached, switched the camera back to photo and this is what I got.
I am quite happy with the result.
And, funny enough, the in-camera focus sclae was showing around 4 meters distance - waaay off the infitiny mark. Not even touching it. Had this confirmed with both 14mm and 10-24.
Fujinon 10-24 @10mm, F4, ISO 1250, 15 second exposure.