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.
