Yes, but if the original poster is talking about ISO 25 then he must be using old firmware.
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I have the new Firmware ...
Yes, the MFDB has now ISO 50 -> ISO 400 ...
But with the adapter and the groundsetting of ISO 25 on the camera, i can
overexposure +1 with ISO 50 setting on the back.
If the adapter should have ISO 50, you must use 2 resistors.
~4 kOhm resistor between pin1 and pin2
and ~700Ohm between pin2 and pin5. (at the moment i am not know the exact values,
the ISO switch on the filmback is a voltage divider ..., at ISO 6400 you have 0Ohm between pin1 and pin2 and 4,72kOhm between pin2 and pin5.
@rainer_v
"how you tested out the resistor values and contacts without having fear to destroy something?"
I have dismantled an old polaroid back ...
Earlier i have dismantled a 6*4,5 back because it hat a problem with the
filmtransport, so i know the switches ...
An other way is to patch the camera firmware ...
There is a Intel 8051 µP Derivat in my camera with a EEPROM on the side ...
Greetings
Adina