I have the Pentax K100D as well and if memory serves me correctly it should fit perfectly. Actually, any lens that you find with a K-mount will work on our camera and you can even find adapters for other lens manufacturers as well. Hope that helps and always feel free to ask questions here!!
That's the beauty of Pentax equipment. All k mount lenses work. I have that lens on my K10d. I also have 25 year old lenses (good glass) that fit perfectly. Good luck with your pics.
Yes, like they said, all K-mount lenses. That means any Pentax-brand lens made in the past, oh, 30+ years as well as any third-party (Sigma, Tokina, Tamron, etc) lens that is listed as being for a Pentax. Any older Pentax lenses require a $30 adapter that you can buy from their web site.
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