Originally posted by newarts .... I have an idea to try.
It was easy to modify the KAF mount on my K100D so all lenses appear to be type "A". The modification is easily reversible.
Remove the metal finishing ring on the lens mount, invert it, put aluminum foil over the appropriate hole, then replace the ring. The mounting plate squishes the aluminum foil against pin A, connecting it electrically, and holding it in place
I used sticky-backed foil so the foil would stay in place as I screwed the finishing ring back onto the camera (the sticky side of the aluminum foil touches the finishing ring.)
All lenses now appear to be A lenses. In operation a manual aperture lens which has been stopped down will meter correctly (if the e-wheel f-number shown in the viewfinder is minimized.)
A & FA lenses work as they should in A mode.
Additionally the on-camera flash adjusts itself appropriately for fully manual lenses however far the attached lens is stopped down.
One of the reasons I did this is that I use 1 FA lens, 2 A lenses, and at least 6 manual aperture lenses (I have no K lenses.)
Dave
PS Using an A lens in M mode works ok if the viewfinder f-number is adjusted to agree with the f-number set on the lens.
I suppose that if a manual K lens is used with this setup, the max/min aperture coding of the other pins should be correct and the e-wheel f-number should agree with the manually set f-number; alternately a new pin stop hole might be put in the lens to prevent the aperture control lever from holding the lens open (that effectively converts the K lens to purely manual.)
Last edited by newarts; 03-06-2009 at 06:01 PM.