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Hi Nick,
I can see why you struggled. It is an APS-C sensor which is 22.3x14.9mm. Not sure why Siril would want to know the frame size in microns. You can work that out however. The frame size is according to gizbot (random website I found) 6000x4000px. You can work out the pixel size from that. Using the astronomy tools website, it shows that the pixels are 3.72-3.72 microns.
3.725 (in the middle) x 6000 (width) = 22350microns in width
3.725 (in the middle) x 4000 (height) = 14900 microns in height
You might want to find the diagonal which will be 26860 microns diagonal.
Hope this helps.
Lachlan
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