Hi, my 18-70 's zoom mechanism has gone bad. It works, but makes a grinding noise when used. It was smooth for about a year. Is it bad? Can it be fixed by myself? is it going to cost me big $ to get it repaired. thanks, Pavan
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Re: zoom mechanism making noise
Well i had the same issue and i just slammed it (carefully of course) on the desk and it started working.... does it still zoom or does it just click and grind? also try zooming in and turning the lens faster outward or the oppsite direction to see if you can jump it back into the correct place on the gears.... my best guess is that it got dropped or the kids sat on it... and it made the gears slip into a bad place....
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There's nothing you can do without stripping the lens down: definitely not a DIY job on your lens!
Barring any actual faults, the smoothness is determined by a number a factors such as how well the components were originally machined, how well the lubricants are distributed internally and the condition of internal bushings. Even the pneumatic action of air entering and escaping the lens as it's zoomed can have an effect.
In practice, new lenses may need a bit of breaking in to become fully smooth, lenses which are not often used will tend to lose their smoothness as inactivity allows internal lubricant films to dry out. I've also found that superzooms such as yours have so many elements moving around inside that it's difficult to find a truly smooth one unless upgrading to a professional grade lens.
If there's anything in the motion which is definitely notchy or catching then there is a fault and the lens will need professional attention, but if the lens is still fully usable then you might decide to live with the fault whilst saving for a replacement lens as labour costs alone will make you wince.
Sorry not to be able to offer anything more positive, but not everything is a quick and easy fix.
Hi all, I've had the same problem. So I decided to give it a try because I didn't find any solutions on the net. Unfortunately you have to pay pretty much for a Canon lens while the internal quality is pretty cheap, the whole mechanism is of plastic and this is also the problem. And after a while some screws will vibrate loose from the plastic components and canon could have done this better.
Probably within your lens is now one of the three zoom mechanism screws complete removed and you will notice that there is some abnormal movement in the zoom part. Unfortunately these screws are deeply mounted inside the lens and you need a lots of skill and patience to get it fixed. First you need to completely disassemble the lens, and please make a picture of your lens after every step you make because I had to disassemble my lens 4 times! Because some of the elements was not right in place. I will try to place a more complete description later today including some pictures. Regards Gert
I hate giving out bad news, but it sounds to me like your focusing motor is broken. I am of course going on the assumption you have the camera set to AF mode, and the lens still doesn't focus. In my experience with SLR lens is that if there are scratching or grinding noises when either focusing or zooming there is almost always something broken inside.
Autofocus function on the D40 only supports lenses with the
AF-S feature, which have an autofocus motor built into the lens,
instead of using an autofocus motor drive built into the camera.
The Tamron lens you have, does not have a built in motor and
the autofocus function relies on the motor drive in the camera.
It will not work with the D40 or D60, but it will work with other
Nikon digital SLRs, such as the D80. Need to get an AF-S
type lens or upgrade to different Nikon digital SLR. Unless
you do this, you will have to manually focus the Tamron lens.
All of the Nikon DX (for digital) series lenses are also AF-S
type, so they will work with the D40, which is designed as
an entry level digital SLR, therefore it is intended primarily
for use with DX lenses, which are typically sold in a kit with
the D40. Most common one is Nikkor 18-55mm DX AF-S.
Other Nikon AF-S lenses made for film cameras (FX type)
will also work with the D40, but these tend to be expensive
professional models. DX series lenses tend to be more
affordable. You might consider the 18-200mm DX AF-S
as an alternative to the Tamron, but these are not cheap.