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04-09-2019, 01:12 PM   #1
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Pentax-FA* 24mm f2 problems

I just received this lens: SMC Pentax-FA* 24mm F2 AL [IF] Reviews - FA Prime Lenses - Pentax Lens Reviews & Lens Database

after ordering from keh, and the autofocus doesn't seem to be doing anything at all. No noise, no focus. MF seems to work ok.

I am using a K-01, with the switch on AF. My other lenses with autofocus are the 40mm XS, and two Pentax-F zoom lenses. AF works fine on all when I push the shutter release halfway.

I'm pretty new to autofocus lenses, so before I send it back for a refund or exchange, is there something obvious that I'm missing? An easy fix or a setting I'm unaware of?


Last edited by ccbl; 04-09-2019 at 02:05 PM.
04-09-2019, 01:19 PM - 1 Like   #2
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The focus ring itself pushes forward and back, and acts as a switch. (You'll see this referred to as a "clutch" in reviews -- several FA lenses and some Sigmas have this type of AF/MF switch on the lens.) You should see the word "autofocus" below the ring when AF is engaged -- if it isn't push the ring towards the front of the lens. (See pictures in the review you linked to -- look at supersize)

Last edited by vonBaloney; 04-09-2019 at 01:26 PM.
04-09-2019, 01:31 PM   #3
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QuoteOriginally posted by vonBaloney Quote
The focus ring itself pushes forward and back, and acts as a switch. (You'll see this referred to as a "clutch" in reviews -- several FA lenses and some Sigmas have this type of AF/MF switch on the lens.) You should see the word "autofocus" below the ring when AF is engaged -- if it isn't push the ring towards the front of the lens. (See pictures in the review you linked to -- look at supersize)
Thanks! I'm glad it was something simple
04-09-2019, 01:39 PM - 1 Like   #4
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Don't feel bad. Most of us who have owned this lens or the FA* 85 1.4 have panicked about the same thing. Easy fix and a nice feature.

04-09-2019, 02:04 PM - 1 Like   #5
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same thing happened to me when I received my FA*300/4.5...

Last edited by pepperberry farm; 04-09-2019 at 03:45 PM.
04-09-2019, 02:04 PM   #6
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Well, now I have a new problem.

The aperture is getting stuck at f22, when attached to the camera.

Everything seems to work smoothly by itself. After I attach it to the camera, if the aperture is set to Auto or f22, it gets stuck. It can't open any wider.

If I attach it while set to f2, it will work at each aperture, up to f22, where it gets stuck again.

I'm guessing this is a lever problem? When I compare it to my other lenses, the lever looks closer to the black bit of metal that sticks up even with it (don't know what that's called). The gap between them is very small.

Any suggestions?
04-09-2019, 02:24 PM - 1 Like   #7
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QuoteOriginally posted by ccbl Quote
Any suggestions?
You could try gently bending the lever . Or best of all just avoid f22. Likely to cause diffraction using that aperture.
04-09-2019, 02:49 PM - 1 Like   #8
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If it was just f22 I might ignore it; but the A setting doesn't work either, and I do want that.

I guess I'll have to send it back after all :|

04-09-2019, 07:50 PM - 1 Like   #9
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I love that lens.
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04-10-2019, 05:35 AM   #10
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QuoteOriginally posted by Marktax Quote
I love that lens.
Keh had another in stock, so they're exchanging it for me. I'm looking forward to it! I love the sample images I've seen.
04-10-2019, 06:16 AM - 2 Likes   #11
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QuoteOriginally posted by ccbl Quote
Keh had another in stock, so they're exchanging it for me. I'm looking forward to it! I love the sample images I've seen.
It gets mixed reviews but i have always liked it.

K1 + FA* 24mm. 1/15 ISO 200 f11

04-21-2019, 02:52 PM   #12
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I've had this lens since it''s first availability. Mine is just great. Sharp, contrasty, great colour rendition and free of aberrations and distortions. Perhaps, since it was 'bleeding' edge technology for Pentax at the time there may have been considerable variance in the production.
04-22-2019, 02:48 AM - 1 Like   #13
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QuoteOriginally posted by BillO Quote
Perhaps, since it was 'bleeding' edge technology for Pentax at the time
Is that where the technicians are constantly cutting themselves on the glass elements during assembly?
05-08-2019, 07:11 PM - 2 Likes   #14
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QuoteOriginally posted by pschlute Quote
Is that where the technicians are constantly cutting themselves on the glass elements during assembly?

Precisely. Those aspherical elements are deadly!
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