Problems with sigma 135 400 apo dg

adam1403

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Adam Smith
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Hi,

I have the above lens and due to the heavy weight of the front of the lens I am finding the zoom is changing unless the camera is completely flat. It has been back to sigma once who serviced the lens and tightened up the zoom ring however I am now having the same problem again. Does anybody know of a way of tightening or locking the zoom in place as it makes it quite tricky to use as the zoom keeps chaining.

Thanks in advance, Adam
 
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