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07-09-2013, 04:15 PM   #1
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16-50 DA* zoom problem

Have had my 16-50 DA* lens for several years and never noticed the problem till now. When I zoom I never look at the ring to see what focal length I'm at, just do a visual. I just noticed that it will not go past 20mm to 16mm. Going back and looking at the data from previous wide angle pics and sure enough most are 20mm with a few 19mm.
Any one heard of this one before ??

07-09-2013, 04:26 PM   #2
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Hi neighbor!
Mine goes to 16 exactly so I'd say something is out of adjustment on yours. I have lots of images that say 16mm in the EXIF. That lens gets a lot of bad publicity, but I don't think I've heard of that particular issue before.
07-09-2013, 07:01 PM   #3
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QuoteOriginally posted by chippaint Quote
When I zoom I never look at the ring to see what focal length I'm at, just do a visual. I just noticed that it will not go past 20mm to 16mm.
Chippaint, do you mean the zoom ring won't physically move from 20mm to 16mm? I've had what jatrax describes with various zooms, but as he said, that's in the EXIF data. If your DA* rings aren't moving, that's a whole different story and more worrisome!
07-09-2013, 08:06 PM   #4
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Zoom it all the way to 50 when not attached to a camera. Then, look for a curved brass piece on the innards (Pretty far in there) if you can see it hanging out at all, that's your problem. Solution? It needs to be put back into place. A bit complicated with this lens. Had a similar thing happen with an 18-55. (Albeit with that lens, the snagging piece was very easy to access)

Alternatively, if it's under warranty (IE: If you bought an extended life warranty), send it back for a physical and a check up.

07-09-2013, 09:03 PM   #5
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Thanks guy's.....Can't see any brass pieces, looks all normal to me. All the zoom rings are collapsing all the way.
I think it has probably been that way since I got it.
Maybe if I send it to Pentax they could tell if it was defective.
Any other ideas ??
07-09-2013, 09:16 PM   #6
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On mine the inner (movable) rear lens comes back to flush with the outer rim when at 16mm. At 20mm it has moved forward about 1/4". See if yours does the same or if it is recessed when all the way to the stop.

Can you check the EXIF of your images (in Lightroom perhaps) to see if the lens ever took a picture at 16mm?
07-10-2013, 08:13 AM   #7
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I've checked and no images were taken at 16mm. Most were at 20mm and a few at 19mm. And my inner rear lens is flush with the outer rim at 20mm.
07-10-2013, 08:51 AM   #8
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QuoteOriginally posted by chippaint Quote
And my inner rear lens is flush with the outer rim at 20mm.
I would say the zoom is out of adjustment. If it's within warranty no question it goes in for service. If out of warranty, I would still send it in, you paid for a 16-50 and you got a 20-50. No idea what it would cost but CRIS should be able to give you a quote. On an older lens I might be tempted to open it up and try adjusting it myself, but not on that lens, too much money at risk if I mess up.

07-10-2013, 08:55 AM   #9
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Do you have any other lens wider than 20mm? 16mm to 20mm is a pretty big difference in FOV. If you have anything else that goes to 16 or 17, you could compare vs your 16-50. It might be a weird glitch..
07-11-2013, 06:44 AM   #10
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Comparing lenses is how I discovered the problem, but thanks for the input. I took it to Advanced Camera Repair in Portland yesterday and the tech said he could hear something rattling around. He thought it should be an easy fix....hope so. I'll no in a couple of days.
I've used these guys in the past and are very good, (Pentax Authorized Repair)
Thank you guys very much....I'll let you know what the outcome is....
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