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cover occurred during the test shots. That is not to say that a high thin cloud could not have passed and more precisely to these two 101's. Whether you would get the same results cannot be guaranteed by The PX625 Battery Adapter allows you to use a modern PR44 675 Blue Tab Zinc Air battery in cameras that require a MR9, 625A, MRB625, PX625, EPX625, PX13, mercury battery. The PR44 675 Blue Tab Zinc Air battery is rated 1.45v and provides a 1.35V output, which is the same voltage as the original mercury battery. This ensures that your camera’s light meter will function properly. both equally smooth, crisp, and seemed to function wonderfully. Now to the reason for this posting. What battery to use. I have previously written about adapting a 675 hearing aid battery for use in cameras that require a 1.35 volt PX625. I was pretty confident at the time that since hearing aid batteries operate at 1.4v that this was the solution to this problem… I have since found out that actually, this solution is not always quite as ideal as I had originally thought.
My solution to this problem, although also not 100% ideal is very cheap and provides the camera with a much closer voltage to that what is required. My Olympus 35rc appears to meter perfectly with these batteries, so if you have a camera that requires a px625 this might well be worth a go! I should add though, if you can justify the cash for a Wein cell, it is probably the best option … This is really just for the sometimes-miserly among us 🙂 thank you Wikipedia) or the battery would discharge itself (down to 1.35v) in the adapter regardless of whether it was installed in a camera? And there doesn't seem to be either the space or the spare voltage for a more complex circuit.The MR-9 adapter uses a Zener diode to reduce the voltage, if I am not mistaken. The electronics actually require a minimal current drain to function properly. See here: I thought the best solution would be easy to come by. The original PX625 mercury batteries that these camera used from oxide cells to the 2.70 Volts that yourlight meter or camera was designed for. No adjustment or modification to your
Zinc air hearing aid batteries have a flat discharge curve and a lower voltage of 1.4v -1.45v. Therefore it is possible to use these with the adapter above as a replacement for the 625. The downside is that zinc air have a relatively short lifetime of around a month, and can discharge blue goo when then are used up.
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cost difference between the solutions. It is close enough that each person will have to make up their The PX625 (also referred to by other names such as PX13) is a small button-shaped 1.35volt mercury battery which great number of camera models were designed to use. Alkaline batteries have an unpredictable drop off in voltage over their life - they start off at 1.5v, but will end up well below 1.35v. Because of the bridge circuit the spotty should be better placed to deal with this than other brands, but I'm not sure if it can compensate for low voltage (others may be able to confirm). The PX625 Camera Battery Adapter replaces MR9, 625A, MRB625, PX625, EPX625, PX13 discontinued mercury cells. Some cameras use a (Wheatstone?) "bridge" circuit and the metering doesn't depend on the battery putting out an exact voltage. Cameras where metering means centering a needle on a short + | - scale (or the LED equivalent), are likely to fall into this category and should work fine with alkaline, silver, zinc-air or NiMH substitutes. Uwe, is the Contarex Super meter like this?
the factory are no longer available in the US. I had read online different possibilities. Different people had different opinions. While many said which battery solution was best, and gave general slightest of possible delays at some shutter speeds. Both went to my long time repairman for a CLA (Clean, Lube, &
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Silver cell with voltage-reducing adapter: the adapters don't contain actual voltage regulators but just a resistor that will reduce the voltage to approximately 1.35V when the current drawn is that of a typical meter circuit. So they'll work perfectly with some cameras in most or all lighting, but not very well with cameras that draw more or less current than the designer expected, or whose current draw changes significantly with the light level.
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