On Mon, 15 Jan 2007 16:18:01 -0500, John Francis wrote: >On Mon, Jan 15, 2007 at 07:28:36PM +1000, jim wrote: >> On Sun, 14 Jan 2007 14:51:56 -0800, Godfrey DiGiorgi wrote: >> >> Under lens ID part, it has correctly picked up both a 80-320 zoom and a >> tamron 28-300 zoom. >> I have tried an A lens and all it said was a series lens.
>It really said "A series lens", not "a series lens". That's different. Mummy, he is picking on me for not pressing the shift key. >That depends on what the camera does. ShowTags just reports what the >camera has put in the various fields. If the camera fills in the >focal length (which I believe the K10D does if shake reduction is on) >then that will show up. It didn't with an old 400mm screw mount lens and an A 135, tho camera did ask for the focal length. >While it is possible, in theory, for a DSLR to read the maximum >aperture from the dumb contacts on an A lens, I don't believe any >of the Pentax DSLRs do so - they rely on the data sent over the >digital signal pin. A firmware change will see to that. I'll get pentax to change it for me................ :P I have been looking at the AF lens contacts and I think what most people call the digital signal pin is infact power for the lens circuity. the mount it self is ground or negative. The A pin remains the same. 2 aren't used, so that leaves 3 pins left. It is those 3 that would have at least Serial data, serial clock and maybe a reset. Not sure tho cause I don't have a logic analiser. Got that info from tracing circuits on a busted sigma lens. James -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
