Originally the connector was discovered by a nikonian who's nick i cant remember but because all posts were lost i decided to give this topic a new try, maybe someone can tell what is the the purpose of the connector.
There is extra connector in the bottom of the D50 battery compartment, it is hidden under little piece of plastic that is quite easy to remove. http://koti.mbnet.fi/shred/Kuvat/D50extra.jpg It was interesting to see that four of the eight connectors were scratched, so the connector is used for something.
Previously speculated and debated usage of the connector.
take your multimeter and set it to continuity (audible would be helpful) You'll need three hands to do this.... touch (or aligator clip) one test lead to the negative battery terminal. touch the other testlead to pin #1 and half press the shutter. Any reading? Now full press. Again, any reading? Go through each pin and I'll bet you'll find the pre-focus and the shutter release. That's how I found my pinouts on my D70. The only difference is that I had to take my camera apart to do the tests. Go to the D70/D70s forum and search "home made grip". Anyone willing to try this on their D50? I'd be willing to lend a hand... good luck
Hmmm... You're right. I was expecting to see <1 ohm with the shutter half pressed. Actually, if you hold your testlead there long enough, you'll see the resistance slowly climb, but should still be less than 10ohms. When you do a full shutter press, you should get a continunity or low ohm reading on another pin. (not pin 5) The pinouts on the D50 pic you sent me shows 8 contacts. I still suspect that a) none of them are power contacts and b) that they are shutter and command/sub-command dials: in no particular order 1) shutter focus (half press) 2) shutter release 3) ground 4) command dial + direction 5) command dial - direction 6) sub dial + direction 7) sub dial - direction 8) (?) possible separate ground for the command/sub command dial.
Again, I can only go by my D70 and the MB-D100 grip that I took apart. But basically, one or possibly 2 contacts would be ground. When you connect this ground pin with one of the remaining pins, your camera should autofocus. Then touching the ground pin to another pin would fire the shutter. The command/sub command dials work almost similar. Depending on which pin you pulse to ground will determine which direction you are 'turning' the command dial, clockwise or counter clockwise. As you can tell, this kind of stuff facinates me. Sort of wish I had a D50 to test my theory on.... good luck. Ron