An update to Pinhole asist is available. It should cure the problem you have, limnidytis.
In addition (the following text is an excerpt of the update information) :
* BETTER CELL ACCURACY,
* BETTER INDICATION OF LONG EXPOSURES,
* SUPPORT FOR HARMAN TiTAN CAMERA (f:206, 250 and 288),
* ADDED DIAPHGRAM VALUES OF 2,4,8,16 for calibrating purpose (use these value to compare measure with your "classical" camera".
* ADDED RATINGS SUPPORT