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Contax RTS and OM4 giving wrong meter readings
Old 06-20-2019   #1
LeicaFoReVer
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Contax RTS and OM4 giving wrong meter readings

Especially Contax is over exposing my shots quite a lot. I got the same reading as my leica m6 if I keep leica at iso 100 and I change RTS to iso 400. The same OM4.

Is that a battery issue as I used alkaline 1.5v? I think they had silver batteries with higher voltage originally??
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Old 06-20-2019   #2
Steve M.
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Your Contax calls for a 6V silver oxide or alkaline battery (Eveready 544, Ucar 544, Mallory PX28, Alkaline Eveready 537 or equivalent). You should be able to put four of the 1.5V button batteries in it, but if not, get the long 6V batteries.
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Old 06-20-2019   #3
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The original RTS used a 6V PX28 or 2x LR44 batteries.

As Steve_M points out you can use 4 1.5V batteries theoretically, but it would be hard to load them in and out of the battery compartment.

Marty
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Old 06-21-2019   #4
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opps sorry my bad guys, I put the 6V but it is alkaline. As I read on internet, some says alkaline instead of silver would cause wrong readings. Can that be the reason?

Or the lightmeters need repair?
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Old 06-21-2019   #5
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Alkaline batteries have different discharge characteristics, but if the batteries are fresh and the cameras are malfunctioning it is most likely that there is something wrong with the cameras. But try to find the correct battery before you take them for repair-it seems suspicious that two cameras would misbehave simultaneously.

Marty
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Old 06-21-2019   #6
David Hughes
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Hi,

PX28 is an old mercury battery designation. You can read all about them here:

http://www.smallbattery.company.org....,DURACELL,PX28

but I don't think he can post them overseas. This is also interesting:-

https://schneidan.com/2015/05/19/the...nd-what-to-do/

The battery characteristics vary between mercury, alkaline, lithium and silver oxide. In a nutshell they all fade and die in a different way and some cameras will compensate for it and some won't and then you have problems. (And some will leak and attack the leads inside the camera and that will cause a HR and affect the metering.)

I'm sorry I can't help more than that.

Regards, David

Last edited by David Hughes : 06-21-2019 at 04:50. Reason: Those CRLF's...
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Old 06-21-2019   #7
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Quote:
Originally Posted by Freakscene View Post
The original RTS used a 6V PX28 or 2x LR44 batteries.

As Steve_M points out you can use 4 1.5V batteries theoretically, but it would be hard to load them in and out of the battery compartment.

Marty
You could use a piece of cellotape/scotch tape to hold them together.
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Old 06-21-2019   #8
p.giannakis
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I can tell you for sure that the Olympus needs a silver oxide batteries - SR44. Don't bother with anything else. I had the same problems with an OM-2n and alkaline batteries.
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Old 06-21-2019   #9
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Quote:
Originally Posted by p.giannakis View Post
I can tell you for sure that the Olympus needs a silver oxide batteries - SR44. Don't bother with anything else. I had the same problems with an OM-2n and alkaline batteries.
I see everywhere that the sellers advertise as silver oxide but they are actually alkaline. Where can I find true silver oxide ones?
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Old 06-21-2019   #10
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Quote:
Originally Posted by Huss View Post
You could use a piece of cellotape/scotch tape to hold them together.
I actually tried to do it after his post and I was able to insert 4 x lr44 buttons carefully without a tape but you need a thick aluminum foil at the top as the buttons weren't touching to the top plate. Then it worked but the readings didn't change.
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Leica M6 TTL x.72
Leica iiif
Leica Elmar-M 5cm f2.8 (rare early version)
Canon 50mm f/1.2 LTM
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Contax G2 + 45mm & 28mm
Contax RX + Zeiss 50mm f1.4
Olympus OM-4 + 24mm f2.8 + 35mm f2
Fed 3 + jupiter-12
Sony NEX 7


websites:
http://www.blurb.com/user/store/aykutkaraca
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Old 06-21-2019   #11
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Quote:
Originally Posted by LeicaFoReVer View Post
I see everywhere that the sellers advertise as silver oxide but they are actually alkaline. Where can I find true silver oxide ones?
There are dozens of sellers on eBay. The Swiss made Renata brand for watches are definitely silver oxide.

Marty
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Old 06-21-2019   #12
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Old 06-22-2019   #13
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Those SR44's are silver oxide but LR44's are not. Many will try to sell you LR44's as silver oxide...


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