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  1. #21
    ic-racer's Avatar
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    Here is another interesting option. This 1.3v fixed regulator is in a package about 3mm in biggest dimention: Texas Instruments TPS79913DDCR
    http://www.mouser.com/ProductDetail/...3TZLPXWgeQo%3d

  2. #22

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    SMDs are the way to go n very little perifery needed.

    Nice find.
    Anyone can make a Digital print, but only a photographer can make a photograph.

  3. #23

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    I think John's solution is the simplest, proven and most cost effective. I mean 1/16 of a stop is more accurate that the camera itself. Why complicate things?
    - Bill Lynch

  4. #24

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    1/16 stop? I have never seen a meter with that much accuracy not even hand held meter. Handheld meter has resolution of 1/10 stop and some of them are accurate to that much but not all those that can display reading in 1/10 stop.

  5. #25

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    Why complicate it, indeed. There is no 1/16th stop obviously, but for the sake of "anality" how accurate does it have to be? ;-) In this example, completed repair at BV 6 is one needle thickness off center (and exactly where IS the EXACT center mark in the OM-1 meter display?) There isn't one, so I estimated "how close is this to zero on this $5000 Kyoritsu EF5000 shutter tester? Crap, it's a needle thickness, let's say 1/16th stop" The "error" is so minute it just doesn't matter. I've been servicing OM for 34 years, and in the 15 years using this 1N-6263 conversion with silver oxide battery, not one complaint regarding "accuracy". John

  6. #26

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    I have never own an OM-1 so I can't say much. But I have many cameras with similar meter design. Even with the correct power (that is you supply it with a rock solid external power supply at 1.35V) I have not seen one that is even accurate to 1/3 stop. It can be adjusted to be right on at 1 brightness level but not over a range say from EV5 to EV14 for example. That is why I don't really care for the meter on these type of cameras. I can simply estimate exposure.

  7. #27

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    no help

    I apologize to the web master for waisting space here. I think this is a valuable service you provide, but not one of the 26 responses addressed my question. I suppose the only people who know how to calibrate an OM1n are the professionals who market their skills at a price. This is just a hobby for me, I'm surprised there isn't another hobbyist with more experience than I have out there somewhere. No matter, perhaps I'll attempt it on my own. Thanks everyone.

  8. #28

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    You're right Chris. Just open the bottom plate of the OM and install the diode, there is plenty of room for it. OTHERWISE.. get a hand held meter, you'll never have to deal this question again.
    Anyone can make a Digital print, but only a photographer can make a photograph.

  9. #29

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    I bought 25 Schottky diodes on ebay fir $6. I put one in one of my junker OM-1 bodies. It was difficult soldering to the stainless battery contact but it works great. The meter has not been calibrated and the camera has not been serviced, so who knows how in-accurate it is, but the pictures came out fine. Cost about 25 cents. Does anyone really need to build an exotic voltage regulator or a grip with AA batteries?
    - Bill Lynch

  10. #30

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    NO. But if you have 25 of em, I'd be interested to take a couple of em off your hands?

    .
    Anyone can make a Digital print, but only a photographer can make a photograph.

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