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01-16-2017, 11:54 AM   #1
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Asahi Pentax - what is this part?

I was doing inventory for a local darkroom association, who got a set of Pentax Takumar time medium format gear for a 'long term loan' (read: bureucrazy for formal disposal would have been too complicated for the donating party).

Everything else I knew what it was, but then there was a metal round plate, about the diameter of 2 coin. So for this I have no clue what it is and what is it used for. Maybe somebody around here knows immediately?

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01-16-2017, 12:05 PM   #2
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A key to help unscrew the cover for the buttoncell that powers the lightmeter on f.i. the K1000 or its predecessors?
01-16-2017, 12:06 PM   #3
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What is on the obverse? Looks like an advertising specialty item - the battery cover key is a good guess.
01-16-2017, 12:18 PM - 2 Likes   #4
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It's the shutter cocking key for the 6x7 series.

01-16-2017, 12:21 PM - 1 Like   #5
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Drake Avenue is right. You can see the operation in the 6x7 instruction manual at page 11 here:
01-16-2017, 12:54 PM   #6
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I knew I could rely on you guys .

I'm gonna print out the quoted manual page and slip it in the same plastic bag so that the future generations will also know.

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645d, 645z, asahi pentax, camera, medium format, pentax
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