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General photography questions and answers: Discuss Lens Problems!!...Hi All, I have a Nikon 18-135mm Lens that I have had for about 18months. I recently took in on ...
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Old 22-09-2008, 22:50   #1 (permalink)
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Lens Problems!!

Hi All,

I have a Nikon 18-135mm Lens that I have had for about 18months. I recently took in on holiday with me, only to find that the auto-focusing system is really struggling. When focusing on an object, the camera WILL focus for a brief second before jumping back again to an unfocused picture. Occasionally the image looks like it HAS focused, only for the sharpness to disappear when the image is on my computer screen... regardless of tripod!!

I thought it had sorted itself with multiple re-mounts, (and crossing fingers of course!!!)... but no...!

I have tried the kit lens that I bought with the camera, and the auto focusing is working perfectly. The lens itself is in great condition, I do really try to look after my equipment.... (The focussing ring feels quite 'clunky' as opposed to smooth mechanism.)

BUT.. the question I had for the masses is:

Is it worth taking it to a High-Street shop to ask about repair for a sub-£200 lens, or forget it and look at a new lens.....?? (or is there a decent on-line company to think about?).. or furthermore any tips to try and repair myself.

Thanks in advance.
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Old 22-09-2008, 23:01   #2 (permalink)
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Re: Lens Problems!!

Quote:
Originally Posted by photo-jay View Post
BUT.. the question I had for the masses is:

Is it worth taking it to a High-Street shop to ask about repair for a sub-£200 lens, or forget it and look at a new lens.....?? (or is there a decent on-line company to think about?).. or furthermore any tips to try and repair myself.
Wonder if it's not the gearing for the AF motor, the gear ring which is partially stripped so it's not moving and/or holding position properly. With the lightweight (and so less expensive) lenses the gearing is just plastic - I had the same type of thing happen (on a kit lens) but on the exposure ring, which eventually failed altogether. I've still got my lens which I've put to one side for when I've got a bit of spare time (and the part) to attempt a repair.
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Old 23-09-2008, 10:13   #3 (permalink)
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Re: Lens Problems!!

Quote:
Originally Posted by Markulous View Post
Wonder if it's not the gearing for the AF motor, the gear ring which is partially stripped so it's not moving and/or holding position properly. With the lightweight (and so less expensive) lenses the gearing is just plastic - I had the same type of thing happen (on a kit lens) but on the exposure ring, which eventually failed altogether. I've still got my lens which I've put to one side for when I've got a bit of spare time (and the part) to attempt a repair.

(The focussing ring feels quite 'clunky' as opposed to smooth mechanism.)

The gear ring and drive gear may be damaged as Mark has suggested ,Photo-Jay.

It could also be some grit or a grain of sand that has got between the two concentric moving "tubes" of the focus ring and body and clutch.
Just try this test. Power the camera in auto focus mode so that the lens focuses at one end of its extreems.ie either infinity or closeup. Note that the manual adjust focus Ring probably does not move (it doesn't on my Canon Lens) but the focus distance indication behind the lens transparent window does. If this is the case and you say that the focus ring "feels Cloggy", its probable due to grit/dirt between the focus adjustment ring and the lens body or the clutch.
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Old 23-09-2008, 12:55   #4 (permalink)
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Re: Lens Problems!!

Whats it like on manual? If it works ok then use that ,should help to hone-up your skills. Probably not the answer you are looking for but repair costs can easily outstrip the cost of a budget lens. I recently had the misfortune to pierce the plastic female tripod mount on my compact and the estimated cost of replacing the mount was astronomical (labour cost ) so I bought a new camera for a few pounds more, got a better camera as well!
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