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Tamron 17-70 hard zooming


RSK22

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Hello, I recently bought a second hand Tamron 17-70 from MPB and a have a small problem. The zooming is smooth from 17-35 but after 35 it becomes harder to zoom.

Is a problem with my lens or is a common thing with the model? I had several other zooms, and they were smooth throught the zooming range

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Depending what is going on internally this can be normal with some designs. For example the Yashica MC 35-70 moves freely from 70 to 45 but then internally one set of elements starts to move along with the first set and it stiffens up. It's even worse coming the other way. Tried several and they're all the same. 

 

Have a look and see what the internal elements are doing and that could give you a clue. 

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