Question about Pentax *ist DS Digital Camera

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Doesnt seem to work with the lens which was on my old K1000 which is a SMC Pentax-M1:2 50mm, serial number 5918334 any ideas?

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  • 3,006 Answers

Although your lens is an older manually operated K mount and will physically fit onto your camera, there are incompatibilities which limit the level to which it is compatible with your *ist DS.

Ignoring the really obvious difference that your lens is totally incapable of autofocus, the first real incompatibility is that your camera body has one of the "crippled" versions of the KAF (autofocus) mount. This means that it lacks the mechanical stop-down coupler/indicator used on the original K mount. The result is that your camera body does not sense which aperture the lens is set to and will not stop the lens down to the selected aperture when you press the shutter release. The full specification KAF mount maintains these old mechanical legacy couplings, but as most owners don't use older lenses any more the crippled KAF isn't an issue to most users and significantly reduces manufacturing costs. Crippled KAF lenses can still use some manual K lenses, but only the ones which have the A setting on the aperture ring and your lens pre-dates this development.

Your only realistic fixes for this are to either replace the camera body with a model supporting the full KAF mount (expensive) or to use later K lenses with the description SMC Pentax A instead of earlier SMC Pentax M. You'll still lack autofocus but as long as the lens aperture ring is set to the A position then it will work when the body is set to shutter priority and Automatic modes. There are far more Pentax A lenses remaining in good condition than Pentax M so you should have no trouble finding them, but because of their compatibility with later mounts you'll find that prices are somewhat higher.

Note that there is no adaptor which will allow you to improve compatibility between your present camera and the lens you have asked about.

I hope that I've answered your question, if so please take a moment to rate my reply. If not, perhaps you should add a comment to further explain in which way your camera doesn't work with your lens and I'll then try to assist you further.

Posted on Sep 14, 2010

Testimonial: "quite right and very helpful, the other lens I have which is wide angle does have the A setting and works. Will have to invest in new lens then.thanx"

  • Obertelli
    Obertelli Sep 14, 2010

    Sorry, typo alert: "Crippled KAF lenses can still use some manual K lenses" should have read as "Crippled KAF bodies can still use some manual K lenses".

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  • 11,967 Answers

The K1000 was a film camera with no autofocus so the lens is a manual focus lens. You're trying to get it to work on an autofocus camera? If I'm not mistaken, you will need some sort of adaptor. You should contact the tech people at the support section of the Pentax web site. They even have a "live chat" feature so you can type back and forth with a live person and get the answers you seek.

Posted on Sep 13, 2010

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  • Obertelli
    Obertelli Sep 14, 2010

    Sorry typrice, but you ARE completely mistaken with your answer, so much so that it's important to point it out to you and to prevent others wasting time or money on pursuing your suggestions. The problem is simple: a Pentax M lens is incompatible with the crippled KAF mount body.

  • Ty Price Sep 14, 2010

    Sorry that I upset you so much. I don't charge for answers. Sometimes I'm wrong but I try to offer help. By doing a live chat with a Pentax tech, the person with the problem would have had a definitive answer. Again, I'm sorry I ruined your day and prompted such a stern reprimand from you. I bow to your greatness.

  • Obertelli
    Obertelli Sep 14, 2010

    Sorry you took it that way typrice, but you completely miss the point: if you don't KNOW the answer then don't answer. I'm trying to help you, not make a personal attack.

    Making an uninformed guess and then advising the customer to go elsewhere for an answer isn't providing a service, even if there is no charge. Although wasting the time of others potentially costs them money which is why some customers are happy to pay for good and fast answers.

    Look at your own stats: 1691 folks thought you were "somewhat helpful" or "not helpful" and 1471 thought you were "helpful" or "very helpful". So 53.2% of the customers who have rated you think you're providing completely or substantially unhelpful answers. You have provided some very good answers at times, so why let your standards slide?

  • Ty Price Sep 14, 2010

    If you read my answer, you see that I say up front that I may be wrong and then immediately suggest that the person try the "live chat" at Pentax. This would have provided the exact information they needed and given them the experience of the live chat service so that, in the future, they would not hesitate to go there for answers. The fact that you looked up my stats and are throwing them "in my face" so to speak, is evidence that I should have taken your reprimand exactly as I did.

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