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06-01-2009, 08:23 AM   #1
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M42 lens on K10d

Can someone explain how the metering will function using a M42 lens with proper adapter on my K10d? I am looking for a long prime and the 300mm Tak is a distinct possibility.

06-01-2009, 09:25 AM   #2
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You mean beyond setting the camera on M, setting the aperture on the M42 and pressing the Green button to test exposure?
06-01-2009, 12:22 PM   #3
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Or:

Use Av mode, stop down the lens, and the camera will set your shutter speed automatically.

(If there isn't a sticky on this somewhere, there ought to be).
06-01-2009, 01:17 PM   #4
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I guess I am not articulate enough with my question. Is the aperture automatic (ie remains full open until shutter is tripped) or manual (stays at aperture set with ring)? I want a lens that stays wide open for focusing - like the Pentax-M mounts. Thanks.

06-01-2009, 01:43 PM   #5
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QuoteOriginally posted by jkglogau Quote
Is the aperture automatic (ie remains full open until shutter is tripped) or manual (stays at aperture set with ring)? I want a lens that stays wide open for focusing - like the Pentax-M mounts.
No. There is nothing in the camera body to close the lens down for you. You have to close down the lens yourself. This is true with all K-mount cameras, including film cameras.
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