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06-01-2010, 11:23 AM   #1
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Lens Repair?

I picked up a K1000 at a goodwill with a 50mm Pentax-A lens on it. I later realized that the focus ring is broken, so i'm basically wondering if anyone know how i would go about fixing this lens, or should i just get a new one? I picked it up for $40. Also anyone know of a good place to find older lenses other than ebay?

Also I tried the lens for kicks on my K-x and my K-x wouldn't take a photo. The F stop spot on the screen just kept flashing in any mode i was in.

Thanks for any help/advice.

06-01-2010, 12:15 PM   #2
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in the custom menu area of the k/x you need to enable the setting that allows you to take shots without the a hook up. by default it does not allow you to take pictures with a lens that dosent have auto aperture. as for the repair... i can't help you there.
06-01-2010, 12:17 PM   #3
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Since it's an A lens, it should work when the aperture ring is set to 'A' position. For other positions, You can refer to this thread for the settings:
https://www.pentaxforums.com/forums/pentax-beginners-corner-q/59272-shooting-...x-dslrs-f.html
06-01-2010, 12:25 PM   #4
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QuoteOriginally posted by Andrew Lang Quote
in the custom menu area of the k/x you need to enable the setting that allows you to take shots without the a hook up. by default it does not allow you to take pictures with a lens that dosent have auto aperture. as for the repair... i can't help you there.
Thanks for the help with the k-x part, i think i'll just bite the bullet on the 50mm lens and try to do better next time.

06-01-2010, 01:23 PM   #5
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QuoteOriginally posted by Spideralex90 Quote
I picked up a K1000 at a goodwill with a 50mm Pentax-A lens on it. I later realized that the focus ring is broken, so i'm basically wondering if anyone know how i would go about fixing this lens, or should i just get a new one?
If the focus ring won't turn, this is how to fix it. The lens was probably dropped. This problem is pretty common with the M50/2 and A50/2. I don't know whether it's a design flaw or just many more lenses produced.

The fix is not that hard. It'll take longer for me to type this than do it. There's a plastic beveled trim ring around the front element. It's supposed to unscrew through the filter threads, but dropped lenses often have damaged or not-round threads. It's not that hard to pry the trim ring out in this case. There are even two slots at its edges for a thin tool.

The trim ring hides three screws for the filter ring. I have a Phillips #00 that fits these screws well enough, and they aren't that tight. Remove them and the filter ring comes off. This is a good time to try and repair dents if you want.

Now there are three more screws which attach the focus ring to an aluminum track. More obvious screws hold down a brass washer that keeps the front lens group from falling out; don't bother with those. The screws you want are deeper, just inside the lettering SMC PENTAX-A 1:2 50mm. With luck they won't be hidden behind the ears for the lens mount. I was able to get my screwdriver in there anyway. Remove these screws and the focus ring comes off.

Now you see the aluminum ring. Careful inspection will reveal that it is not parallel with the plane of the lens mount. Look at the gap between its lower edge and the ring with the DOF scale. One side probably has no gap. You can use a knife blade or flat screwdriver to pop this aluminum ring back into place. Some care is required to avoid damaging the ring or DOF scale, but it shouldn't require much force. When it pops back, the aluminum ring should turn smoothly and the lens should focus again.

Move the aluminum ring so that the lens elements are as far back as they go, back towards the mount. Put the focus ring back on with the infinity symbol lined up with the orange diamond mark, and only one screw tight. Mount the lens on your camera and focus on a distant object, something that should be a few miles away. The distance scale probably reads 10 meters or so. The lens can focus "beyond infinity" now; you need to set infinity correctly or the space-time continuum will be damaged. Loosen the tight screw and move the focus ring without changing focus, until the infinity symbol again lines up with the diamond. When you're happy with that setting, tighten all the screws and continue reassembly.
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