I have a Pentax *ist DS digital SLR which won't autofocus. When I set it to autofocus, it zooms itself out so the image is blurry and in the eyeview it shows the macro image and a hexagon flashes Help! What is wrong???!!!
I've had my Pentax *ist DS dig. SLR for 4 years. I've had no problems until 2 weeks ago when it refused to autofocus on anything more than a foot away. Now it has decided it can focus on things further away, but with the wrong focal length; so I don't have the focus symbol flashing irraticly, it just takes everything slightly out of focus. I haven't changed any settings on the camera and the batteries are full. Maybe dusty sensor inside or a camera that's dead..?
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Re: Pentax *ist DS digital SLR Autofocus problem
Being an SLR camera, you should try another lens. It may be a servo fault in the lens. If the lens is okay, then it can be anything in the lens sensing, lens control drive circuits, and or lens to camera interface area. This would have to be properly diagnosed and serviced.
I had a similar problem with my istD until I finally managed to fix it.
Take off the lens and gently lift the reflex mirror with you finger nail.
Very gently prise open the secondary mirror concealed underneath it to check that it moves freely.
Now take a pencil eraser and rub the electrical contacts around the lens mouth on the body.
Give them a good rub and blow out any resulting dust.
Pop the lens back on and take a few shots to confirm that autofocus now works perfectly (make sure you have fresh batteries)
Let me know if it works for you too.
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If the lenses are PK / PKA bayonet fitting, yes - if they are autofocus as well, this is a bonus, as that too should work. If they are M42 screw-fit, then you'll need an adapter, and all functions (zoom, focus, exposure) will be strictly manual.
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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I don't own a K10D, but I do own a K100D which I have successfully used both manual focus & auto-focus lenses from my old Pentax stash!
1) If it is a manual focus lens, you need to turn off Autofocus on the body of your K10D. On my K100D, there is a switch on the side of the lens mount that says [-MF or -AF]. "-MF" is manual focus mode & "-AF" is autofocus mode. Since your lens doesn't have autofocus capability, turn it to the "-MF" mode.
Also . . . When I press "Menu" and go to "Custom Setting", I change two settings . . .
1) I change "Using aperture ring" to "Permitted". This allows you to use manual lenses (M lenses) that do not have an auto(exposure) setting, and also lets you use Auto lenses (A, KA, KA2, FA, etc.) in either the Auto or manual aperture setting modes.
2) I change "Fl with S lens used" so that even with a manual focus lens, although I don't have autofocus capability, my K100D beeps and shows a little red square in the viewfinder when I have successfully focused manually!
The K10D should have the same options.
This should get you up and running!
I have had a load of fun with my old lens on my new digital Pentax!
Go to the following page and select category "cameras", sub category "Digital SLR" & you will find all the *istDS manuals for download:
Please update the question & let us know if the information given was useful to you - Good Luck!
Looks like its true... Another major disadvantage. Removing TTL means removing one more hardware piece - TTL sensor. Pentax removed almost every nice feature, which needs some aditional or more expensive hardware: no TTL flash, less AF points, pentamirror... Seems like I bought Ds right in time.