Jean-Luc,

If you "check the box" (I assume you mean the "Use Scale" box) please make sure that the scale given is the correct scale. That is, if the "Units" box is set to app (which means arcseconds-per-pixel) then the "Low" and "High" boxes above it should be a bit below and a bit above your telescope/camera's actual arcseconds-per-pixel value. Make sure that auto-update is also checked, so the next time it plate-solves successfully, it automatically puts the solved value in there.

Hy

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