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12-15-2011, 04:47 PM   #1
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lenses for K100d

Hi - I'm potentially looking at buying a used Sigma 70-300mm f/4-5.6 APO DG Macro Lens for my Pentax K100d. Has anyone used the same before and did it prove reasonably compatible?
Any suggestions for telephoto lenses will be gratefully received.
Many thanks

12-15-2011, 04:51 PM   #2
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Welcome to the forum. Note that there is a Beginner's forum that is a good place to ask basic questions like this, so I'm moving this there. Also, as you might image, it has been asked many times before, so do check the many existing threads on this topic, and also the Lens Review section of the site. There is also Lens subforum for questions about lenses.
12-15-2011, 05:21 PM   #3
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Thanks - yeah did fond them afterwards! :-)
12-15-2011, 05:41 PM   #4
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Sigma has made a lot of 70-300's but I think this is the one you mean. The lens database on this forum is a resource beyond price. Always search here before buying any lens.

12-15-2011, 08:54 PM   #5
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I recommend a used Pentax DA L 55-300mm in the classifieds section of this forum for approximately $200. Fantastic bang for your buck. It is a great lens and very reasonably priced.
12-16-2011, 02:28 AM   #6
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Not for the specific lens.

As long as lenses have a screw drive for focusing, they are compatible with the K100D. The lenses that only have SDM/DC/HSM/... will become manual focus lenses. Examples are e.g. the Pentax DA17-70 and, if I'm not mistaken, the Pentax DA18-135WR.
12-16-2011, 02:29 AM   #7
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thank you - after doing a little research, i'm keen to stick to a pentax lense.
12-16-2011, 05:06 AM   #8
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Sorry, maybe I was not 100% clear but a Pentax DA17-70 is SDM only and will not autofocus on the K100D.

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