I don't think sticky aperture blades would be beyond his competency.

Eric had a look at my Tokina and apparently didn't have any problems getting it apart & putting it back together. He was not able to fix it because there was a worn out part that he couldn't get a replacement for.

I've since had another guy take a look at it and while he had it disassembled, he showed me what part needs to be replaced. The needed part is an "information brush" quite similar to the one shown in the Pentax F 70-210 link.


I'm pretty sure the part my lens needs isn't specific to the Pentax lens mount and a part taken from a lens of the same model in a different mount would work in my Tokina.

But, if not, the fix shown in the above Disassembly/Repair page suggests I might be able to fabricate a usable replacement part if I can't find a similar lens to cannibalize.

On 8/10/2018 14:41, P. J. Alling wrote:
If Eric will fix the Tokina, he'll be doing you a special favor.

He doesn't have manuals on anything but Pentax, so he'll just go deep enough to fix the immediate problem, he doesn't want to be responsible for destroying your lens, and I don't blame him.

On 8/10/2018 1:14 PM, John Sessoms wrote:
I think several on the list have had good results from Eric Hendrickson in Knoxville, TN.


On 8/9/2018 20:38, J.C. O'Connell wrote:
last week I was extolling the virtues of my mint Tokina manual focus
AT-X 90mm F2.5 macro lens (the"Bokina") and now this week it takes a

problem is a sticky aperture ( stays wide open at moment of exposure
regardless of f stop setting ). It has this problem both on the "A"
setting and when f stops are set manually with the aperture ring.

does anyone know of an experienced shop that still services these lenses?
its such a quality optic I hate to scrap it.

thanks in advance, jco

Science - Questions we may never find answers for.
Religion - Answers we must never question.

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