Pentax SP500

[Smudger]

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.

 

[Smudger]

I can confirm that a silver oxide SR41SW or equiv.,used with a 7mm internal x2mm O-ring will work.

 

[1L6E6VHF]

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!

 

[titrisol]

The Energizer 387S works pretty well. It fits the battery chamber perfectly.

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

 

[BradS]

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.