Yeah, sorry about your troubles Bruce. I don't really understand how the camera electrically controls aperture with A lenses onwards, but triggering the aperture itself is still all mechanical. I had a feeling that it might be something bad in the movement of the lever. If you are getting correct EXIF information (focal length, selected aperture, etc), then the lens is probably communicating with the camera ok. I try to keep a cheap AF 28-80 around as a beater/emergency lens. My current FA28-80 is pretty banged up and needs replaced with something slightly more robust. Hope you have something that will work out for your shoot.
On Sat, Jun 14, 2014 at 6:09 PM, Bruce Walker <[email protected]> wrote: > No and no. The EXIF records what should have happened, not what I get. > Zooming apparently mechanically sticks the aperture wide open. > > > On Sat, Jun 14, 2014 at 6:04 PM, Attila Boros <[email protected]> wrote: >> Sorry to read that. Can you stop it down in DOF preview? Is the >> aperture recorded in EXIF data correct? >> >> On Sat, Jun 14, 2014 at 11:08 PM, Bruce Walker <[email protected]> >> wrote: >>> I think I know the answer to this, but what the hell. >>> >>> I'm testing a lighting setup today. K-3 on M, remote triggered flashes >>> for light. Settings are around 1/125th, ISO 200, f:11. >>> >>> So I zoom in on my test object, ~35mm, shoot, exposure is perfect. I >>> pull the zoom out, 16mm, shoot, exposure is _wildly_ off. Lightroom >>> suggests at least 4-5 stops overexposed, but it's madly clipped. WTF? >>> This is repeatable. But every once in a while, like after >>> power-cycling K-3, the exposure is right. >>> >>> Long story short: cleaned the contacts of both K-3 and 16-50, nothing. >>> Swapped an 18-55 in and bingo! 100% perfect exposure at all zooms. >>> >>> So it looks like the DA* 16-50 is failing to stop down for the shutter >>> under some circumstances, like very wide zoom. Has anyone else >>> experienced this? Is it something that one can fix, eg by giving it a >>> good smack? :-) >>> >>> Thanks! >>> >>> -- >>> -bmw >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> [email protected] >>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>> to UNSUBSCRIBE from the PDML, please visit the link directly above and >>> follow the directions. >> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> to UNSUBSCRIBE from the PDML, please visit the link directly above and >> follow the directions. > > > > -- > -bmw > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
