I don't think there are dumb questions in life just dumb answers!! That said I must ask where the formula came from to make the adjustment of the camera setting for film speed? And I would have to wait for others to answer on the possible damage caused by higher voltage? Though I have to wonder as It's not a lot of difference but then I am brain damaged and have been very wrong in the past on things!! I will at least see how much it cost to have a pro add the diode to the battery circuit and hope I can afford it before the mercury battery goes dead! Or as my Friend in NZ would say suck a Kumara!! Any other replies?