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03-15-2008, 04:20 PM   #1
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Sticky focus behaviour with Vivitar 105mm macro?

Hi guys,

Has anyone experienced any weird focusing behaviour with their Vivitar series 105mm macro when focusing back from 1:1 to around 1:1.2? While focusing out my copy kind of "sticks" at that magnification, even though focusing in the other direction is just fine. (And with the lens of the camera.) I've got the same issue on both my k100d and my k20d and can't figure out why.


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03-16-2008, 06:23 PM   #2
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My copy is fine, testing it now and from 1:1 to 1:1.2 it is just as perfectly smooth as the rest of the range.
03-31-2008, 01:50 PM   #3
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re: sticking vivitar 105mm

I had a similar problem with a lens I bought last November as new "old stock". The focusing ring worked normally, except when lens was fully extended, after which the focus ring stuck and would not return until I removed the lens from the camera. Because of how difficult they are to find, I did not want to return the lens. A local camera repair shop wanted minimum $100 just to open it. I got brave and removed the mount to get a look inside, where I discovered that the linkage from the mount to the diaphragm was misaligned and slipping behind the mechanism where it got stuck. A slight bend of the tang with needlenose pliers did the trick, and I have had no further problems.

note: opening a lens is not for the faint-of-heart!

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