OK, the first thing that came to my mind was to make the CCD_INFO property configurable. But I know too little about the indigo architecture if this is possible or makes sense at all...

I did the following:
- downloaded indigo from github
- added the following in indigo_ccd_iidc, line 258:

CCD_INFO_PIXEL_SIZE_ITEM->number.value = CCD_INFO_PIXEL_WIDTH_ITEM->number.value = CCD_INFO_PIXEL_HEIGHT_ITEM->number.value = 3.75;
- compiled everything

This seems to work, I know that this is a personal hack and not a general solution ;-)

Best regards,
Frank

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