Question about Pentax *ist DS Digital Camera

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Using Pentax lenses from 35 mm on the digital camera.....

Had Pentax 35 mm film camera. Given an ist DS digital body. Not doing something right, obviously, to use the old lenses. Told they should work. Figure have to do manually, not auto. Just need to know what to do. I do have one auto lense.......wide-angle. Works fine. Others don't. Would appreciate any help you can give me.

Thank you. Barb

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  • StewD Jul 19, 2008

    I install the lens from my 35MM camera but cannot get the camera to take a picture. Also, I great difficulty getting the lens to release for removal. Any ideas as to why the camera won't take the picture or why the lens is so difficlut to remove?

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I have old Lenses that I use; you must set your lens to manual, Switch left hand front of body. That should resolve the problem.

Posted on Sep 03, 2008

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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.

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Go to the following page and select category "cameras", sub category "Digital SLR" & you will find all the *istDS manuals for download: http://www.pentaximaging.com/customer_care/manuals_literature Please update the question & let us know if the information given was useful to you - Good Luck!

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