My Fingers Stick to My Sigma 70-300mm APO

Started 1 week ago | Questions thread
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Bob Contributing Member • Posts: 573
My Fingers Stick to My Sigma 70-300mm APO

This lens is about 20 years old, I guess. I rarely use it.

When I fully extend the barrel to 300mm, the tube that is attached to the camera has some sort of sticky residue which leaves black marks on my fingers.

Any idea what this is and how to clean it off? Water based solvents just seem to make it more sticky.  Can I use WD-40 or Ronsonol?

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