They're old. Lubricants dry out. It's a very good lens, if you can find someone to do an inexpensive CLA it's worth it.

Ralf R. Radermacher wrote:

Hello all,

Today, I've received my 'new' M2.8/35 mm and the aperture closes
extremely slow. I had just discarded another lens of this type for
exactly the same reason. Never had such trouble with any of my other
Pentax lenses.
Is there something about the 2.8/35 mm?

Ralf



--
When you're worried or in doubt, Run in circles, (scream and shout).

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