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Re: camera will not auto focus
Take the lens off and rotate the focus ring, it should turn very easily with little gear noise.Try a different AF Pentax lens that you know is good.
I'm sure the lens is binding, take the lens to a camera repair shop for an estimate cost to repair.
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A few years ago that noise was extremely common on almost all body motor driven AF lenses, and it's not exactly uncommon these days.
Your kit lens is not bad, but it is built down to a price as a get-you-started measure. It's not built as well as the upgrade alternatives and is certainly not built to last nor with repairs in mind.
Your fix is to eventually replace your lens, preferably with one which has a built in motor which will be near silent and far faster to focus. Note that if your lens has become harder work for your camera body focus motor to operate then it will put an extra strain on the motor and can shorten it's lifespan.
How new is the lens? In or out of warranty? If out or warranty most likely solution is to find a Sigma authorized repair shop because your description sounds like the auto-focus motor gear has failed. If in warranty, check out Sigmaphoto.com for repair sites and also download the SIGMA_SERVICE_REQUEST.PDF. I've only had to deal with Sigma once on warranty matter and they were very helpful, provided UPS authorization for shipping on their nickel.
Your motor may have gone bad. If it makes a loud squeaking noise, it is definitely the motor. Try sending it to PhotoTech Repair Service in NYC. They are Nikon authorized, and can do the repair under warranty if you still have it. Also if you join they're facebook page, they will give you a 10% discount.
Here is the facebook page link, it has everything you need to send it in.
I had the same issue with my Nikon d60...my 18-55mm did auto focus but
my 55-200mm only manual focused, i thought it might have been my camera
as i heard that not all lenses are compatible with my d60 but it turned
out to be the focussing motor or something that was damaged, it was
making a very funny noise when it tried to auto focus with it,like a
screeching sound..if this is the case you should get it repaired and
looked at, also check on the lens if it says it is a AF lens,if so make sure th switch on the side of the lens is switched on AF not MF. hope it helps
Your Sigma 28-300mm doesn't have a HSM-motor as far as i know. When you switch it from MF to AF, you also have to disengage the manual focusing ring by pulling it towards the camera, or pushing it away from the camera. Using the AF without unlocking the manual focusing ring may damage the AF motor.
I hope this helps,
The lenses have a focus motor built into them.when the camera is set to auto focus, once you press the shutter button, the motor activates to set the correct focus. VR is for motion stabilization. Turn off AF on lenses and camera and see if noise stops.
When in video camera mode, press menu, and change auto focus mode from c (continuous) to s (single). The noise you hear is the auto focus motor going back and forth, trying to find the object focus constantly. You can use this only if the object is not changing the distance to the camera while recording.