Hey, nice tip - thanks. I haven't used exiftool before.

No FOCUSTEM in my images:
$ astfits -h0 Test*.fits |grep FOCUSTEM
$

Since I don't have a cooled camera, it seems to just set the CCD-TEMP instead:
$ astfits -h0 Test*.fits |grep CCD-TEMP
CCD-TEMP= 22. / CCD Temperature (Celsius)

I bet it's a bug in EKOS that results in CCD-TEMP being "22." instead of "22.3" or similar.
The UI displays the full value in all areas (Focuser tab and Capture tab). But 100% of my images have a FITS header CCD-TEMP that ends in a ".".

Of course, with the dot at the end, the filename ends up being:
$ exiftool '-filename<%f_${CCD-TEMP;}.%e' Test.fits
1 image files updated
$ ls Test*
Test_22..fits

Now I need to find the proper forum to report the above bug.

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