Use of The Rollei 35 Today
The Rollei 35, Rollei 35 S and Rollei 35 T use a MR-9 mercury-battery with 1.35 volts, which is no longer produced due to environmental considerations. But there are alternatives available. A zinc-air cell also provides 1.35 volts, yet with a limited usage time of 1 to 6 months after first activation depending on the design of the cell. Otherwise the light meter may be adjusted for use of mercury-free silver-oxide batteries. Without adjusting, the higher voltage of 1.55 volts would lead to overexposure by 2 to 3 aperture steps. An adapter to fit the smaller silver-oxide battery to the battery compartment is required. The closest one in size to the original MR-9 would be SR-44. Alkaline batteries such as the LR-9 a.k.a. PX 625U can not be used, since alkaline cells do not provide constant voltage and will lead to underexposure after becoming half-depleted. An other option is the adaption of the camera for 1,5 V batteries by a Rollei work shop.
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