Thanks for that.
We must of been watching this at the same time
Yeah well foolish me as soon as I loaded Siril dived right in into get some stacking done, obviously noticing that all my CR2 files were greyed out so assumed that was that.
From my understanding CR2 files can be used for conversion to processing within Siril but the final output for further processing is a 16 bit TIFF i think.
Ideally would be great to use a stand alone program for conversion as I'm rather keen to give star tools a crack also.
There must be a program out there that folks who use Star tools that require FITS or 32bit conversion besides PS (assuming that ps does do that).