A clue! Thanks. Aperture lever itself seems fine, but it only works more or less normally from 50 down to somewhere between 35mm and 28mm. Then as I zoom it wider I hear a metallic springy noise from inside and the aperture goes wide and stays stuck open. Ie the return spring doesn't close it unless I force it manually by manipulating the aperture lever.
Definitely something borked inside that lens. Just great. Got a big shoot on Tuesday. Oh well, forces me to use another lens and do different stuff than I had planned. Might spur creativity. :-P On Sat, Jun 14, 2014 at 5:49 PM, Zos Xavius <[email protected]> wrote: > Doesn't the aperture lever toggle the aperture on the 16-50 like all > pentax lenses? Does it feel stiff? Is it bent at all? > > On Sat, Jun 14, 2014 at 4:08 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.
