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Smudger

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Aug 9, 2004
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303
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Dunedin,New Zealand
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My Pentax Spotmatic F also calls for a mercury cell, but since the meter is a bridge circuit it is "happy" with a silver oxide cell. Given that both my Spotmatic F and the SP 500 rely on the centering of the needle for setting the exposure I'm pretty certain that the SP 500 also uses a bridge circuit. Thus a silver oxide cell which will physically fit should be fine. BTW, check with Pentaxforums.com for good info on all Pentax gear.
 

1L6E6VHF

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Joined
Apr 24, 2014
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171
Location
Monroe, MI
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I bought a Spotmatic F, with f1.8 lens, at a garage sale for $5 USD, a few years ago.
I found that the contact for the meter battery had corroded away.

No problem. I just pretend it's an H3!
 

BradS

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Joined
Sep 28, 2004
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Soulsbyville, California
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387S is a 394/380 with an adapter ring
Any battery that is 3.6mm tall will work with an o-ring to stabilize it

The beauty of the 387S is that it comes from the factory with the little plastic "shoulder". It it fits the Spotmatic battery chamber perfectly straight from the manufacturer.
 
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