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Message |
    
David_ritchie
Tinkerer
Username: David_ritchie
Post Number: 68
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, December 23, 2010 - 11:02 am: | 
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I just read on e bay where an Olympus 35RC was converted to use a 1.5 V siver oxide battery by inserting a Schottky diode in the battery circuit. Can anyone give me details of this procedure? Thanks |
Hanskerensky
Tinkerer
Username: Hanskerensky
Post Number: 66
Registered: 05-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, December 23, 2010 - 12:58 pm: |
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David, a fellow Dutchmen of mine developed an mercury cell replacement adapter kit with a Schottky diode. He has no secrets about it so you can see the whole story here :
http://www.butkus.org/chinon/batt-adapt-us.pdf
Guess you just have to add that Schottky in the battery lead. |
M_currie
Tinkerer
Username: M_currie
Post Number: 246
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, December 23, 2010 - 01:22 pm: |
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You might want to check your 35 RC's performance with an alkaline or Silver Oxide battery. Mine is reasonably accurate without conversion, and a little offset of the ASA dial might be easier than any other treatment. |
Waynemel
Tinkerer
Username: Waynemel
Post Number: 188
Registered: 08-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, December 23, 2010 - 02:41 pm: |
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Isn't the way the battery drains as much of an issue as the voltage difference?
I thought that mercury batteries had a very shallow curve as they lost power, while the alkaline batteries drained much more steeply. |
Hanskerensky
Tinkerer
Username: Hanskerensky
Post Number: 67
Registered: 05-2009
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, December 24, 2010 - 07:20 am: |
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That's true about the Alkaline but not about the Silver Oxide which has a very shallow curve as well.
Another factor is of course if the cameras electronics have or have not an inbuild voltage stabilizer, many vintage cameras and lightmeters don't have. |
Glenn
Tinkerer
Username: Glenn
Post Number: 876
Registered: 07-2006
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, December 24, 2010 - 07:51 am: |
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Wayne is partly correct in his assumption and the Butkus link above gives chapter and verse on the scientific and practical information for those in the dark.
For two reasons my personal choice is to use the MR9 adapter - I purchased a job lot some years ago from a bankruptcy sale and at £10 for 12 adapters the 'make it yourself' option was a none starter. However the main reason is that I never leave the cells in my infrequently used film stock cameras, so why go to all the all the bother of internal surgery when one can just pop an adapter in or out as the need arises? |
