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Posted by David Marsh on January 21, 2000 at 17:50:31:
In Reply to: Nikkormat FT metering. posted by John Taylor on January 20, 2000 at 18:51:12:
Good Day John,
Have you changed the batteries recently? The original battery for the Nikkormat FT was a 1.35 volt mercury cell. The current replacement is a 1.5 volt alkaline cell. This will overdrive the meter circuit and cause from one to two stops of underexposure and sometime affect the linear response of the meter as well.
I'd suggest using the Wein Photo Cell MRB-625 ($5.99 and in stock) to replace your battery. It's a 1.35 volt zinc oxide cell that has similar characteristics as the original mercury cell. Unfortunately they don't last very long! Once activated by peeling off the green plastic sheet full working voltage is reached in about two hours (although they're usable in a few minutes). Once full working voltage is reached, they start to die. The zinc oxide cells generally last about six months, but hold the 1.35 voltage steady during their short life.
There are other alternatives as well, the meter can be calibrated to accept the alkaline cells. But this is not practical unless the camera is in need of other repairs. CRIS Camera services (http://www.criscam.com) cells the MR-9 battery adapter ($29.99 plus $3.00 for the battery). It's a container the size of a 625 battery in which you insert a silver oxide "76" type cell. The container has a diode that drops the voltage of the 76 cell from 1.5 to 1.35 volts.
Sincerely,
Dave Marsh
Apex Photo-Technical Services, Inc.
Manchester, NH
: I have a black Nikkormat FT with a Nikkor-H 50mm f2.0, and the meter is way over sensitive. Always giving a very high reading. Has anybody seen this problem before and is this easy to rectify?
: Does the metering in FT's tend to suufer from a common fault, as I have seen a few FT's with this fault.
: John.
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