Joined in 2023 
82 
63 About this deal
I've been reading up on this and it seems to depend very much on the model of camera how well the various substitutes work. For instance:
cost difference between the solutions. It is close enough that each person will have to make up their both equally smooth, crisp, and seemed to function wonderfully. Now to the reason for this posting. What battery to use. Other meters were designed with the constant 1.35V of a mercury cell as a fundamental assumption. In this case using any other type of cell can cause problems. But different problems with different cameras because of the way the meter is affected by the characteristics of the cell.And finally, the moment of truth… The MR-9 battery adapter giving the Leica MR-4 the correct voltage. factor that must be considered in your choice. I personally removed it from the equation by factoring in the Also, one of the sources I found said straight out that the "CRIS" adapters just used a series resistor to drop the voltage. But it's possible that the Small Battery Company does it differently.) 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: 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 very stable 1.35V output, which is the same voltage as the original mercury battery. This ensures that your camera’s light meter will function properly.
The mercury oxide battery problem, at Konica SLR system, providing information about the PX625 and PX675 battery that is not specific to Konica models SR-7, SR-7V, SR-100, SR-101, SR-102, SR-200, SR-201, SR-202, SR-MC, SR-SC, SRT 101, SRT 101b, SRT200, SRT201, SRT202, SRT-MC II, SRT-SC II Many cameras and light meters were designed for and require a 625 mercury cell: list of cameras and list of exposure meters. Some cameras and exposure meters were designed for 625 sized cells but include voltage regulation circuitry and thus do not require a PX625 to function properly ( list of devices), and so can use the higher-voltage (and less voltage-stable) alkaline (PX625A, 1.5v) or Silver-Oxide (S625PX, 1.55v) cells. Devices without regulation circuitry (or some method of compensating for other voltages) can use Zinc-Air type cells made especially - with the correct 1.35v potential - to replace the mercury cells. changes in the lighting between test shots. I did not use a studio setting for the tests. Exposures were conducted in the daylight, ensuring that no cloud 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 generalBefore the manufacture of mercury batteries was banned, many cameras were designed to use them. Because mercury batteries produced a constant and reliable voltage, many cameras were built without any voltage regulation in the metering circuitry. Unless preventative measures are taken, use of other kinds of batteries gives erratic exposures and meter readings.
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. The adapter is made of high-quality brass and features a large air hole for improved battery activation. It is also compatible with a wide range of cameras, and Vintage Light Meters. A detailed list of compatible cameras can be found below, see description. RPX625 / RM625 / KX625 / HD1560 / 1124MP / Mallory RM-625R / Eveready E625N / Burgess HG-625R / 4370 / 4371 / V13PX / EPX13 In the following 3 photos you can see the MR-9 battery adapter on the left, with a modern PX625 on the right. Positive side faced up Negative side faced up with the MR-9 battery adapter empty Negative side faced up with the MR-9 battery adapter with 386 battery slotted inAnother mercury PX625 replacement is a zinc air battery. The WeinCELL MRB625 is a custom zinc/air battery designed to replace banned
slightest of possible delays at some shutter speeds. Both went to my long time repairman for a CLA (Clean, Lube, & NiMH rechargeable: 1.2V: may not even be possible to calibrate the meter for this voltage, and if you do it will be way off if you run out of charged--up batteries. oxide cells to the 2.70 Volts that yourlight meter or camera was designed for. No adjustment or modification to your 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?
Similar Products
This copper-made adapter can convert a LR44 battery or 675 zinc-air battery (also known as hearing aid battery) into a PX625. I recommed using a 675 zinc-air battery because its voltage is 1.4v, which is very close to the voltage of PX625, while the volage of LR44 is 1.5v. The light meter is more accurate when your battery has a more appropriate voltage. That is one advantage of using an adapter+hearing aid battery over using a LR625. Make your self a little sausage of blu-tak, plasticine or in my case play doh (I have a 2 year old, this stuff come to hand easily) and wrap it round the very edge of the battery making sure it doesn’t intrude on the flat [+] end. Then simply place it in the battery cap.
Great Deal 
New Comment