Both of these cameras have different type of sensor and not the Cds type in your Nikon F. It's better to get a brand new Cds cell to replace. You need to see the size and shape of the Cds cell in the Nikon F and of couse the resistance characteristic. If you want to convert to newer type of cell it's still better to buy a new cell and design the circuitry.
Cds cells don't die. It's the resistor under the speed dial that wears away. SeeAre Cds cells still being made? I was thinking that the reason no one repaired F and F2 meters was that the Cds cells are not available. I need to take apart my FTN meter to see how it is made. I looked for a diagram for it could not find one.
Are Cds cells still being made? I was thinking that the reason no one repaired F and F2 meters was that the Cds cells are not available. I need to take apart my FTN meter to see how it is made. I looked for a diagram for it could not find one.
Thanks, this is helpful, once I have a cell that will fit I will need to find the right set of resistors the compensator resistor may be key. But once I change that resitor might need to change the others.I found the service manual but to down load the manual I have to pay. But I can do a screen shot of the page with the diagram. The FTN finder has 2 Cds cells.
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The problem with these meters is generally said to be the resistive track wears out - the "functional resistor" in the circuit diagram. This is like the track of a potentiometer and not a standard electronic component you can buy. If it were just a question of replacing the CdS cells, then someone could probably try to replace the cell with another CdS cell and adjust some of the trimpots to get it to work over some range.
There are two CdS photoresistors in parallel. If one of them went bad, you would probably see slightly off meter readings, but the meter would work. It is unlikely that both would go bad at exactly the same time.
I think I will replace all the resistors. Next step is set up a work station so that I tear down the FTn head. Might to get a new soldiering iron with the smallest tip. I think I have all the tools. Getting the silicon bule out of the Sigma SD9 should be too difficult as I don't need to be careful taking it apart.
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