DA* 50-135 QuickShift problem?

kyprous · 06-11-2013, 02:08 PM

Just got the DA* 50-135 lens 2nd hand from a member on this forum and tried some sample shots.
All was good until I noticed that the QuickShift sometimes wasn't working when turning counter-clockwise after the lens autofocused.
Both K-7 and lens were set to AF.
The link to this youtube video shows excactly what I experience, but this guys doesn't work sometimes when turning clockwise.

You Tube

Any ideas why this is happening? Is it common? Any tips?
I'm kinda concerned if this is going to turn into a bigger malefaction.

Adam · 06-11-2013, 02:31 PM

Originally posted by kyprous

Just got the DA* 50-135 lens 2nd hand from a member on this forum and tried some sample shots.
All was good until I noticed that the QuickShift sometimes wasn't working when turning counter-clockwise after the lens autofocused.
Both K-7 and lens were set to AF.
The link to this youtube video shows excactly what I experience, but this guys doesn't work sometimes when turning clockwise.
Pentax DA* 50-135/2,8 Quickshiftproblem - YouTube
Any ideas why this is happening? Is it common? Any tips?
I'm kinda concerned if this is going to turn into a bigger malefaction.

If you were still half-pressing the AF button, that might explain it. Otherwise it might be some sort of defect.

kyprous · 06-11-2013, 02:50 PM

Originally posted by Adam

If you were still half-pressing the AF button, that might explain it. Otherwise it might be some sort of defect.

No I wasn't

The thing is, this issue is not consistent... Sometimes the focus ring doesn't work, some times it does.
When it doesn't work while turning anti-clockwise, if I turn it slightly in the opposite direction - clockwise, and then anti-clockwise again, it works.

Any ideas what the defect might be so that i can estimate what the cost could end up being to fix it?

VisualDarkness · 06-11-2013, 04:40 PM

Maybe some kind of sticky coupling? I don't know the construction of it but my guess is either some switch that is sticky, a loose spring or maybe a screw that has loosen too much so it won't engage anymore.
I should be a super easy fix for them.

06-11-2013, 02:31 PM	#2
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,595	Originally posted by kyprous Just got the DA* 50-135 lens 2nd hand from a member on this forum and tried some sample shots. All was good until I noticed that the QuickShift sometimes wasn't working when turning counter-clockwise after the lens autofocused. Both K-7 and lens were set to AF. The link to this youtube video shows excactly what I experience, but this guys doesn't work sometimes when turning clockwise. Pentax DA* 50-135/2,8 Quickshiftproblem - YouTube Any ideas why this is happening? Is it common? Any tips? I'm kinda concerned if this is going to turn into a bigger malefaction. If you were still half-pressing the AF button, that might explain it. Otherwise it might be some sort of defect. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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06-11-2013, 02:50 PM	#3
kyprous New Member Join Date: Nov 2012 Photos: Gallery Posts: 7 Original Poster	Originally posted by Adam If you were still half-pressing the AF button, that might explain it. Otherwise it might be some sort of defect. No I wasn't The thing is, this issue is not consistent... Sometimes the focus ring doesn't work, some times it does. When it doesn't work while turning anti-clockwise, if I turn it slightly in the opposite direction - clockwise, and then anti-clockwise again, it works. Any ideas what the defect might be so that i can estimate what the cost could end up being to fix it?

06-11-2013, 04:40 PM	#4
VisualDarkness Veteran Member Join Date: Nov 2011 Location: Uppsala, Sweden Photos: Gallery Posts: 4,439	Maybe some kind of sticky coupling? I don't know the construction of it but my guess is either some switch that is sticky, a loose spring or maybe a screw that has loosen too much so it won't engage anymore. I should be a super easy fix for them.