Originally posted by enemix Just found this thread and wanted to add my experience.
My K-x differs two full stops between Av and M modes on two of the three M42 lenses I own. I found that my Helios (the one that meters correctly in Av) shorted the contacts on the mount while the other did not. So I tried putting some aluminium foil between lens and mount to short the contacts when I attached the other two lenses and it worked, I now get the same exposure in both Av and M modes with those lenses as well.
So FWIW shorting the contacts seems to work on the K-x at least.
Great reply, from a K-x owner like me. I am sorry but you put the foil over all contacts? Because we must use un adapter that I made permanent in my M42 lens, and dig a hole for the lens to lock, so the mount pin lock them. Now I must care for the mount contacts to be shorted some how, that s it? All of them? No mater what information the contact pass! It will work like that...amazing, I am going to try this as soon I get home! thanks a lot!