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[OM] Re: Sigma lens

Subject: [OM] Re: Sigma lens
From: Larry <halpert@xxxxxxxxxxxxx>
Date: Fri, 09 Nov 2007 05:39:17 -0500
Chuck Norcutt wrote:
> Notice the brass/gold contacts around the lens flange. 
> These are electrical contacts for an autofocus lens which also has an 
> electrically controlled diaphragm. That why, when you adapt OM or other 
> lenses to your E510 you 
> won't have any automation.  No automatic aperture control and no auto 
> focus.
These contacts are to tell the Pentax camera the focal length, and 
aperture information, any MTF information put on the chip, etc. No 
in-lens motor (Its an old lens). The circle with slot next to the bottom 
screw connects the focus motor. Full metering, auto-diaphragm, all auto 
& program modes including MTF, and auto focus in all Pentax bodies 
including the ones made right now. (K10D, etc.)

Larry
>   



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