I was busy with my daughter, so I didn't touch a line of code and (more important) I did't test if the light meter readings are OK...
I would like to develop a wizard to add custom camera/lens configurations, and test another exposure equation I've found in wikipedia for incident-light meters, (now I use the http://www.exposurecalc.mobi/ one). I hope I'll find some spare time!!!
Thanks for the support.