Here you have the German page of the OTE150. I'm still looking for a decent English page but I think it's pretty obvious what you can find there. If there are problems with language or so just pm me.
EDIT:
This guy uses the OTE150 in combination with a 10" F/4.8 for shooting pictures. Again, this site is in German.
EDIT 2:
This guy uses a 12" newt on the OTE150. But I guess it's an F/4 and lightweight.