>on 12/17/01 1:16 PM, Bill Owens at wowens1@xxxxxxxxxxxxxxx wrote:
>
>> I just received my Pentax 1/21 Spotmeter from ebay. I want to replace both
>> batteries, one of which is a common 9V battery. The other battery appears
>> to be dead and is labeled "640". Does anybody know if this battery, or its
>> equivalent is still available?
>>
>> Bill, KG4LOV
>> wowens1@xxxxxxxxxxxxxxx
>>
>The 640 battery used to be mercury, those are no longer available (a shame
>since the Minolta HiMatic E and some small Olympus rangefinders used them).
>Duracell makes an alkaline 640A that fits and powers the camera, but of
>course the voltage is different. I don't know if that throws off the meter
>or not, on the Minolta camera you need the battery to make the shutter
>work... I suppose if the Pentax 1/21 spotmeter uses the battery with a
>voltage regulator it might not matter.
>--
>
>Jim Brokaw
Keenly interested as I picked up an old spotmeter recently. Can't work out
why it needs two batteries!? I suppose the 640PX is a 2.7V and the alkaline
a 3V. Sigh. I think I've seen a silver version made by Excel (Chinese) but
I'll have to check. If so, I'll test one against my still working merc.
What's the 1/21 mean?
AndrewF
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