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GrahamNR17
Joined: 17 Jan 2009 Posts: 1855 Location: Norfolk, UK
Expire: 2012-09-06
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Posted: Wed Dec 07, 2011 2:02 pm Post subject: Pentax meter on SV |
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GrahamNR17 wrote:
I have one of those clip-on meters on my Pentax SV (the one with the round "switch" around the meter needle area. Does anyone know of a currently-available battery that will work with it?
I'll post a picture later if it helps. |
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peterqd
Joined: 28 Feb 2007 Posts: 7448 Location: near High Wycombe, UK
Expire: 2014-01-04
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Posted: Wed Dec 07, 2011 2:12 pm Post subject: |
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peterqd wrote:
It will probably have been designed for an obsolete 1.35v mercury battery Graham. I suggest you take it to your local chemists and ask them if they have a hearing aid battery which fits. You might need to make an insulating collar to stop it from shorting out.
The Spotmatic batteries were a special shape with an insulating collar, maybe your meter uses one of those too - a picture of the batter compartment would help! You can still get this shape (Energizer 387 off the top of my head) but they are silver oxide type, 1.5v, so the meter needle will probably be inaccurate if you use one. _________________ Peter - Moderator |
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GrahamNR17
Joined: 17 Jan 2009 Posts: 1855 Location: Norfolk, UK
Expire: 2012-09-06
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Posted: Wed Dec 07, 2011 2:32 pm Post subject: |
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GrahamNR17 wrote:
Ah, 1.35v, probably the old PX 625 then There's a direct replacement air cell that's the same voltage I'll go and see if the Little Battery Company has any.
Thanks Peter, you're a star |
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peterqd
Joined: 28 Feb 2007 Posts: 7448 Location: near High Wycombe, UK
Expire: 2014-01-04
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Posted: Wed Dec 07, 2011 3:03 pm Post subject: |
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peterqd wrote:
GrahamNR17 wrote: |
Ah, 1.35v, probably the old PX 625 then There's a direct replacement air cell that's the same voltage I'll go and see if the Little Battery Company has any.
Thanks Peter, you're a star |
I think more likely it was a PX400. That's the one the SP and SPII use. The Spotmatic F uses PX625 but that was later on.
_________________ Peter - Moderator |
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GrahamNR17
Joined: 17 Jan 2009 Posts: 1855 Location: Norfolk, UK
Expire: 2012-09-06
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Posted: Wed Dec 07, 2011 3:25 pm Post subject: |
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GrahamNR17 wrote:
The Pentax meter has a bottom contact and a side contact, so I don't think it would use the PX400 due to the plastic insulating ring. But I shall see if I can find a manual online to check first |
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peterqd
Joined: 28 Feb 2007 Posts: 7448 Location: near High Wycombe, UK
Expire: 2014-01-04
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Posted: Wed Dec 07, 2011 6:49 pm Post subject: |
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peterqd wrote:
GrahamNR17 wrote: |
The Pentax meter has a bottom contact and a side contact, so I don't think it would use the PX400 due to the plastic insulating ring. But I shall see if I can find a manual online to check first |
I found it. You were right first time Graham, the manual says a 1.35v Mallory PX13B or PB13, which is another reference for the PX625. The Wein Cell equivalent would be the best for you, but they aren't cheap and they have a finite life once unsealed, usually about 6 months at best. _________________ Peter - Moderator |
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GrahamNR17
Joined: 17 Jan 2009 Posts: 1855 Location: Norfolk, UK
Expire: 2012-09-06
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Posted: Wed Dec 07, 2011 7:05 pm Post subject: |
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GrahamNR17 wrote:
peterqd wrote: |
GrahamNR17 wrote: |
The Pentax meter has a bottom contact and a side contact, so I don't think it would use the PX400 due to the plastic insulating ring. But I shall see if I can find a manual online to check first |
I found it. You were right first time Graham, the manual says a 1.35v Mallory PX13B or PB13, which is another reference for the PX625. The Wein Cell equivalent would be the best for you, but they aren't cheap and they have a finite life once unsealed, usually about 6 months at best. |
Splendid. I shall call you Sherlock Holmes
Thanks for the warning on battery life. When I win the lottery, I'll get one of those little adaptors with the voltage reducing circuit, but at 30 quid, it's a considered purchase. For now I got the Wein for 5.50 which will at least tell me how well the meter still works. |
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peterqd
Joined: 28 Feb 2007 Posts: 7448 Location: near High Wycombe, UK
Expire: 2014-01-04
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Posted: Wed Dec 07, 2011 7:27 pm Post subject: |
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peterqd wrote:
Elementary, my dear Graham. And if I win the Lottery I'll buy you one! _________________ Peter - Moderator |
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luisalegria
Joined: 07 Mar 2008 Posts: 6602 Location: San Francisco, USA
Expire: 2018-01-18
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Posted: Wed Dec 07, 2011 8:45 pm Post subject: |
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luisalegria wrote:
SR44 works on mine.
Just set the film speed to the next lower setting if I recall correctly.
Best to check it against another meter to find the exact ajdustment. _________________ I like Pentax DSLR's, Exaktas, M42 bodies of all kinds, strange and cheap Japanese lenses, and am dabbling in medium format/Speed Graphic work. |
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