M42 lens on K10d

**jkglogau** · 06-01-2009, 08:23 AM

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.

rormeister · 06-01-2009, 09:25 AM

You mean beyond setting the camera on M, setting the aperture on the M42 and pressing the Green button to test exposure?

Mike Cash · 06-01-2009, 12:22 PM

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).

**jkglogau** · 06-01-2009, 01:17 PM

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.

SOldBear · 06-01-2009, 01:43 PM

Originally posted by jkglogau

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.

06-01-2009, 08:23 AM	#1
jkglogau Site Supporter Join Date: Jun 2008 Location: Florida Posts: 384	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.

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06-01-2009, 09:25 AM	#2
rormeister Veteran Member Join Date: Dec 2007 Location: USA Photos: Gallery Posts: 626	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
Mike Cash Veteran Member Join Date: Jan 2007 Location: Japan Photos: Gallery Posts: 6,950	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
jkglogau Site Supporter Join Date: Jun 2008 Location: Florida Posts: 384 Original Poster	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
SOldBear Veteran Member Join Date: Feb 2009 Location: Alameda, CA Posts: 3,206	Originally posted by jkglogau 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.