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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 I am curious why there are so many many posts on the Internet on how to make substitutes for the Mercury PX625 batteries. If you consider camera cost, the lifetime cost of film, chemistry, etc.. that you will pay with this camera is it important to save a couple dollars/euros/pounds on a light meter battery? 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 in 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. If the Pentax you are referring to is a Spotmatic F, it should have bridge circuits that compensate for the extra voltage of Silver Oxide batteries without compensation (best not to use alkaline batteries)... if there is a discrepancy between your Spotmatic F meter and another source it may be due to other factors.
both equally smooth, crisp, and seemed to function wonderfully. Now to the reason for this posting. What battery to use. factor that must be considered in your choice. I personally removed it from the equation by factoring in the 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
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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). cover occurred during the test shots. That is not to say that a high thin cloud could not have passed Discharge characteristics - the voltage of the mercuric oxide cell was fairly constant until it was fully discharged, whereas some cells (in particular alkaline) have a voltage that decreases steadily with time 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.
almost exactly in sync with only minor differences in a couple of spots. I think that this can a attributed to some differences in the Voltage - the voltage of the mercuric oxide cell was 1.35v, the voltage of many of the popular alternatives is 1.5v or so Plase note that this adapter cannot change the voltage of the battery. (though some very expensive ones do: they have a chip that can adjust the voltage. I don't think it is worth it) 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. Another mercury PX625 replacement is a zinc air battery. The WeinCELL MRB625 is a custom zinc/air battery designed to replace bannedThe LR9 is the least expensive PX625 replacement. They fit perfectly but, as with all alkaline cells the voltage is 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.
Before 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.
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Making sure none of your chosen malleable material is encroaching on the thread of the cap, screw it into the camera.
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