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sigma 105 macro lens

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    Kool_Kat
    Kool_Kat e2 Member 8141 forum postsKool_Kat vcard United Kingdom
    30 Aug 2011 - 12:22 PM

    My macro lens has started making a grinding noise when trying to zoom in and out anyone any idea what it could be or how I can make it better it is my fave lens
    Thanks Kat

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    30 Aug 2011 - 12:22 PM

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    Steamdreamer
    30 Aug 2011 - 1:23 PM

    Sounds like a job for the experts if you can't clear the problem with a blower. Not likely to be cheap though!

    Carrera_c
    Carrera_c  5255 forum posts United Kingdom3 Constructive Critique Points
    30 Aug 2011 - 2:41 PM

    Just a minute, isn't this lens a fixed 105mm? No wonder it's grinding when your trying to zoom!

    Assume you mean when focusing, was it dropped recently? Sounds like a cog or something's fell out of alignment or been damaged. Definitely one for the repair department.

    User_Removed
    30 Aug 2011 - 3:48 PM

    Kat, the grinding noise you can hear is from the focussing mechanism, if you want to focus manually you need to put the lens into manual focus (the focus ring slides into a different position).

    siggy.jpg
    To enable manual focus mode, the focus ring needs to be slid backwards and clicks into position. The reverse is required to enable AF to operate again

    Kool_Kat
    Kool_Kat e2 Member 8141 forum postsKool_Kat vcard United Kingdom
    31 Aug 2011 - 7:09 AM

    Thank you everyone better put a new one on my Xmas prezzie list Wink
    Kat

    phillips
    phillips  869 forum posts Scotland2 Constructive Critique Points
    9 Sep 2011 - 7:52 AM

    Hold the bus , I think there's some confusion here.

    On Nikon D300 you are using, to use the Sigma 105 in manual focus, autofocus is decoupled using the lever to the bottom right of the lens throat (as you look at it) on the camera body. The clutch mechanism on the lens, others are describing, where the focusing ring is pulled back, is to disable focus movement and lock it at a given point.

    Turning the focus ring without selecting manual focus on the camera body will give you nasty grinding noises. Some lenses do allow you to override the camera body and focus with the focus ring while autofocus is selected but not the Sigma 105.

    Guy

    scotty94
    scotty94  9 United Kingdom
    25 Sep 2011 - 8:48 PM

    I had this same issue with my Sigma 105 on a Sony body, whereby it was making the same noises whilst trying to focus in autofocus mode. It would be fine until it reached the upper limits of the AF and the would grind.

    Mine was a case of it shearing the focussing gears inside the lens which upon a bit of searching is 'apparently' a common fault with the Sigma on Sony bodies, combined with having the lens showing in Manual and the body in AF which the lens doesn't like apparently.

    All I did when this happened with mine was as Chris_L suggests, use it in Manual mode, I did this and didn't see any detrimental affects on picture quality.

    Was also an excuse to upgrade to a Nikon D7000 and Nikon 105mm f/2.8G AF-S VR which is stunning!

    User_Removed
    25 Sep 2011 - 10:33 PM


    Quote:

    Was also an excuse to upgrade to a Nikon D7000 and Nikon 105mm f/2.8G AF-S VR which is stunning!

    Got it in one!

    User_Removed
    25 Sep 2011 - 10:34 PM

    .....but the Siggy equivalent should be OK as long as you don't try to "zoom" it. Any AF lens will hunt a bit at very short distances, as is the norm for macro.

    scotty94
    scotty94  9 United Kingdom
    25 Sep 2011 - 11:00 PM

    Exactly, leave the siggy on manual and all will be fine Smile

    Deffo agree with above, my siggy used to hunt like mad on some occasions, and to some degree the Nikon does with it's 'breathing' both cracking lenses though when they hit the focus.

    Main point is, to Kool_Kat, please don't bin this lens because it won't auto focus, try it in Manual, the benefits are more than worthwhile and is great experience, I only upgraded as was already looking for a replacement body for my Sony A100 and only switched brands due to my siggy failing and being disillusioned with Sonys offerings in bodies and accessories at the time.

    My humble recordings of both lenses and bodies can be seen here....

    http://www.flickr.com/photos/28678602@N04/

    Last Modified By scotty94 at 25 Sep 2011 - 11:00 PM
    Kool_Kat
    Kool_Kat e2 Member 8141 forum postsKool_Kat vcard United Kingdom
    2 Oct 2011 - 6:45 PM

    Thank you everyone I have sent it back to Sigma cost 89 (ouch) + 7.50 special delivery Jacobs told me it would cost 20 for them to post it and may cost from 100 to 150 to repair so I have saved a bit I have checked out the Nikon 105 VR ( want one ) Smile cant wait to get it back
    Kat

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