Pentax FA* 85mm - sticky AF

Started Jun 20, 2022 | Discussions thread
OP JawaT Regular Member • Posts: 188
Re: last try of a maybe

KPM2 wrote:

Hello again JawaT

JawaT wrote:

I am using AF-S.

That is such a nice lens, therefore my last try:

What happens in AF-S and LV AF ?.

This lens is at full open not very sharp and it has also a little focus shift and has at full open beside the main maxima focus point also beside maxima...and that is not so easy to handle for the AF of the camera. Of cause, my FA* 85 focus snappy in AF-S, but, and this is my last maybe: is the front lens or the back lens a little dirty, like a fine film is on it. That could irritate the phase AF, but a contrast AF in LV could live with it.

best regards KPM2

Well, AF was intermittent for a while, but now has stopped working completely. Regardless of whether I am using the viewfinder or Live View, it does not focus when set to Auto Focus.

When the trigger is pressed halfway, I can hear something whirring in the lens, but the lens focusing mechanism does nothing. Manual focusing works beautifully.

I guess I have to get it serviced. Very likely, one or motor in the lens has failed.

Thanks for all the suggestions.


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Pentax KP Pentax smc DA 18-135mm F3.5-5.6ED AL [IF] DC WR Sigma 18-300 F3.5-6.3 DC Macro OS | C +3 more
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