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08-24-2019, 10:13 AM   #1
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Join Date: May 2016
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Pentax 18-270 DA - Zoom Lock fault


I've been using a Pentax DA 18-250mm f/3.5-6.3 Lens for a couple of years and been really pleased with it. Clearly it's not a top-end lens but for my budget it has proved excellent and a really versatile workhorse that I rarely take off the camera.

One of its features is a "zoom lock", designed to lock the zoom mechanism at the 18mm position when the camera/lens isn't being used.

Whilst away on holiday recently the lens has become locked "permanently" at the 18mm position even when the zoom lock itself it "off", so the lens cannot now be zoomed at all.

Has anyone else experienced this and if so do they have any hints for addressing the issue? Is it worth trying to get repaired or is the cost likely to be about the same as buying a new lens? Any other recommendations?

Any advice would be gratefully received.

Last edited by mikechriste; 08-24-2019 at 02:39 PM.
08-24-2019, 11:17 AM - 1 Like   #2
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Join Date: Mar 2012
Location: Venice, CA
Posts: 7,740
I don't have that lens so I don't have any useful advice on a workaround.

Precision Camera quotes $262.50 USD to fix that lens which is around half of what a new one would cost in the US.
08-24-2019, 06:01 PM - 1 Like   #3
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Join Date: Jul 2012
Posts: 43
Is your lens the 18-250 or 18-270 (title says 270 but post mentions 250)?

What I do know is that the 18-250 can get stuck at 18mm when an internal part gets loose: there's a small screw which is accessible via a hole in the zoom barrel under the rubber grip. If the screw loosens it can protrude into this hole and lock up the lens.This makes the lens feel like the zoom lock is applied even when said zoom lock switch is working normally.

My advice would be to peel back the rubber grip, inspect any access holes and make sure any visible screws are nipped up tight. If you're lucky this will solve the problem.

Edited to add: seems I'm not the only one to have fixed this problem. A quick search found a post here describing a similar problem and detailing the repair steps: the offending screw and collar can clearly be seen in the pic:

Last edited by Suzhouren; 08-24-2019 at 06:08 PM.
08-25-2019, 08:55 AM   #4
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Join Date: May 2016
Posts: 5
Original Poster
Hi Suzhouren,

Apologies, the lens is the 18-250 (I corrected the post but forgot to edit the title )

Anyway - I am very much obliged to you, your advice proved to be 100% spot-on: I found the screw under the rubber grip and it had come loose - tightened it up accordingly and all is now good.

Many thanks!


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