Well, Hugo is looking into it. Meanwhile, I put my 6x12 back on that had a roll of konica 750 in it. I attached it to the back and pulled the darklide (done indoors, overcast) for 3 minutes with the lens caps on. Same results, very dense negs all the way through except one shot I had done a few weeks back indoors near the window. I'll post the usable shot when it's dry.