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**jatrax** · 03-28-2016, 04:42 PM

Has anyone had any issues with the 16-85 so far? From what I read here it has been very trouble free.

However, this week while on vacation mine quit auto-focusing. Manual focusing works fine. Auto-focusing results in a slight back and forth movement of the lens and then the blinking green hex. It will sometimes focus at infinity but never closer than that.

Tried several other lenses on the body including the 18-135 and 60-250 and those work fine.

Tried the 16-85 on a different body and get the same failure.

Getting ready to send it in to Precision but thought I would post here in case anyone has had a similar issue or has any DIY solutions.

Paul the Sunman · 03-28-2016, 08:34 PM

Mine has been trouble free. The DC motors are generally very reliable. Keep us posted; it would be useful to know the cause.

timb64 · 03-29-2016, 02:07 AM

Originally posted by Paul the Sunman

Mine has been trouble free. The DC motors are generally very reliable. Keep us posted; it would be useful to know the cause.

Likewise,no problems after 9 months.

**BigMackCam** · 03-29-2016, 02:19 AM

Sorry to hear that, John. As you know, I had a couple of defective examples supplied new, but unrelated to the problem you're seeing. When I experienced problems, I searched high and low on the web and came across other instances of the problems I'd found, but don't recall anything to do with AF. The only thing I can find that may be related is *this*.

carlopezzi104 · 03-29-2016, 11:28 AM

Mine is ok ...

**jatrax** · 03-29-2016, 01:00 PM

@biomedical thanks for the link that does seem to be very similar to my issue.

**BigMackCam** · 03-29-2016, 01:04 PM

Originally posted by jatrax

@biomedical thanks for the link that does seem to be very similar to my issue.

I've been called some things before, but "biomedical" is a new one

Hope you get the AF issue resolved

seventysixersfan · 03-29-2016, 01:16 PM

Originally posted by BigMackCam

I've been called some things before, but "biomedical" is a new one

autocorrect fail!

**jatrax** · 03-29-2016, 01:50 PM

Oh my! I really hate the auto correct on this tablet. Sorry about that.

**BigMackCam** · 03-29-2016, 02:01 PM

Originally posted by jatrax

Oh my! I really hate the auto correct on this tablet. Sorry about that.

No problem... I liked it - made me sound rather intellectual

Tanker · 08-01-2017, 07:48 PM

Originally posted by jatrax

Has anyone had any issues with the 16-85 so far? From what I read here it has been very trouble free.

However, this week while on vacation mine quit auto-focusing. Manual focusing works fine. Auto-focusing results in a slight back and forth movement of the lens and then the blinking green hex. It will sometimes focus at infinity but never closer than that.

Tried several other lenses on the body including the 18-135 and 60-250 and those work fine.

Tried the 16-85 on a different body and get the same failure.

Getting ready to send it in to Precision but thought I would post here in case anyone has had a similar issue or has any DIY solutions.

I'm having the exact same issue with the 16-85.

The lens will take a slight step towards focus but that's it. Tried different bodies K-5 and K-7 with the same result. Other lenses work fine.

Were you able to find a solution?

**jatrax** · 08-02-2017, 10:49 AM

Originally posted by Tanker

Were you able to find a solution?

Sent to precision, repaired under warranty. I suspect ( but do not know) that a screw or something came loose preventing the lens from focusing. Has been fine ever since.

Paul the Sunman · 08-02-2017, 12:51 PM

Originally posted by jatrax

Sent to precision, repaired under warranty. I suspect ( but do not know) that a screw or something came loose preventing the lens from focusing. Has been fine ever since.

That's what happened to mine. In fact, the screw worked its way right out of the lens. Fixed by CRK free of charge, even though it was out of warranty. They guessed that insufficient loctite had been applied in manufacturing.

Corsair3811 · 06-11-2018, 10:55 AM

I had same problem caused by loose supply contacts on the lens. Contacts can be easily removed by unscrewing two tiny screws next to the contacts. After cleaning and tensioning everything seems to be ok.

03-28-2016, 04:42 PM	#1
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,992	DA 16-85 focusing problem Has anyone had any issues with the 16-85 so far? From what I read here it has been very trouble free. However, this week while on vacation mine quit auto-focusing. Manual focusing works fine. Auto-focusing results in a slight back and forth movement of the lens and then the blinking green hex. It will sometimes focus at infinity but never closer than that. Tried several other lenses on the body including the 18-135 and 60-250 and those work fine. Tried the 16-85 on a different body and get the same failure. Getting ready to send it in to Precision but thought I would post here in case anyone has had a similar issue or has any DIY solutions.

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03-28-2016, 08:34 PM	#2
Paul the Sunman Pentaxian Join Date: Aug 2011 Location: Melbourne Photos: Gallery Posts: 4,847	Mine has been trouble free. The DC motors are generally very reliable. Keep us posted; it would be useful to know the cause.

03-29-2016, 02:07 AM	#3
timb64 Pentaxian Join Date: Apr 2012 Location: /Situation : Doing my best to avoid idiots! Photos: Gallery Posts: 9,514	Originally posted by Paul the Sunman Mine has been trouble free. The DC motors are generally very reliable. Keep us posted; it would be useful to know the cause. Likewise,no problems after 9 months.

03-29-2016, 02:19 AM	#4
BigMackCam Digitiser of Film Join Date: Mar 2010 Location: North East of England Posts: 20,704	Sorry to hear that, John. As you know, I had a couple of defective examples supplied new, but unrelated to the problem you're seeing. When I experienced problems, I searched high and low on the web and came across other instances of the problems I'd found, but don't recall anything to do with AF. The only thing I can find that may be related is this.

03-29-2016, 11:28 AM	#5
carlopezzi104 New Member Join Date: Feb 2016 Posts: 11	Mine is ok ...

03-29-2016, 01:00 PM	#6
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,992 Original Poster	@biomedical thanks for the link that does seem to be very similar to my issue.

03-29-2016, 01:04 PM	#7
BigMackCam Digitiser of Film Join Date: Mar 2010 Location: North East of England Posts: 20,704	Originally posted by jatrax @biomedical thanks for the link that does seem to be very similar to my issue. I've been called some things before, but "biomedical" is a new one Hope you get the AF issue resolved

03-29-2016, 01:16 PM	#8
seventysixersfan Pentaxian Join Date: Aug 2010 Location: Alexandria, VA Posts: 2,054	Originally posted by BigMackCam I've been called some things before, but "biomedical" is a new one autocorrect fail!

03-29-2016, 01:50 PM	#9
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,992 Original Poster	Oh my! I really hate the auto correct on this tablet. Sorry about that.

03-29-2016, 02:01 PM	#10
BigMackCam Digitiser of Film Join Date: Mar 2010 Location: North East of England Posts: 20,704	Originally posted by jatrax Oh my! I really hate the auto correct on this tablet. Sorry about that. No problem... I liked it - made me sound rather intellectual

08-01-2017, 07:48 PM	#11
Tanker New Member Join Date: Dec 2010 Location: Overland Park, KS Posts: 13	Originally posted by jatrax Has anyone had any issues with the 16-85 so far? From what I read here it has been very trouble free. However, this week while on vacation mine quit auto-focusing. Manual focusing works fine. Auto-focusing results in a slight back and forth movement of the lens and then the blinking green hex. It will sometimes focus at infinity but never closer than that. Tried several other lenses on the body including the 18-135 and 60-250 and those work fine. Tried the 16-85 on a different body and get the same failure. Getting ready to send it in to Precision but thought I would post here in case anyone has had a similar issue or has any DIY solutions. I'm having the exact same issue with the 16-85. The lens will take a slight step towards focus but that's it. Tried different bodies K-5 and K-7 with the same result. Other lenses work fine. Were you able to find a solution?

08-02-2017, 10:49 AM	#12
jatrax Site Supporter Join Date: May 2010 Location: Washington Cascades Photos: Gallery \| Albums Posts: 12,992 Original Poster	Originally posted by Tanker Were you able to find a solution? Sent to precision, repaired under warranty. I suspect ( but do not know) that a screw or something came loose preventing the lens from focusing. Has been fine ever since.

08-02-2017, 12:51 PM	#13
Paul the Sunman Pentaxian Join Date: Aug 2011 Location: Melbourne Photos: Gallery Posts: 4,847	Originally posted by jatrax Sent to precision, repaired under warranty. I suspect ( but do not know) that a screw or something came loose preventing the lens from focusing. Has been fine ever since. That's what happened to mine. In fact, the screw worked its way right out of the lens. Fixed by CRK free of charge, even though it was out of warranty. They guessed that insufficient loctite had been applied in manufacturing.

06-11-2018, 10:55 AM	#14
Corsair3811 New Member Join Date: Oct 2017 Posts: 4	I had same problem caused by loose supply contacts on the lens. Contacts can be easily removed by unscrewing two tiny screws next to the contacts. After cleaning and tensioning everything seems to be ok.

DA 16-85 focusing problem

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