I didn't realize that even M42 mount lenses are handled. That goes back a
*long* ways.
Chuck Norcutt
> -------Original Message-------
> From: Larry <halpert@xxxxxxxxxxxxx>
> Subject: [OM] Re: canon 5d manual focus lenses which work well/poorly?
> Sent: Jun 17 '07 03:45
>
>
> Yes, as mentioned in my other post, you are correct. KA lenses onward
> (have been around since about 1980) are chipped, so they communicate
> with the camera, and is able to control auto diaphram, and in
> HyperProgram mode, one of the program preferences is "MTF" so if you
> like the camera chooses the sharpest aperture for each lens based on the
> chipping since Pentax has had that feature for a while.
>
> K mount lenses and M42 mount lenses are not electrically connected to
> the camera, so they meter by pressing a button on the camera. The camera
> stops down, takes an instant reading, opens right back up again, and
> sets the camera. Alter at will.
>
> Larry
>
> chucknorcutt@xxxxxxxxxxxxxxxx wrote:
> > But I think you'll find the Pentax lens compatibility better than Nikon.
> I don't know this for a fact but from the descriptions I've read it appears
> that the K10D is able to control auto diaphragm operation on at least KA
> lenses and maybe K lenses as well. Larry will know. It also appears that he
> is doing metering without any special considerations that a manual lens is
> mounted.
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