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 Vintage Aluminum Lens Flange 38 mm  US $29.99
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 RUBBER HOOD CLEANING KIT CAP FOR CANON T1I XSI XS XTI US $11.99
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 UV ultraviolet CPL FLD filter lens cleaning kit hood for Canon 40D 30D 20D 50D US $19.99
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 Vintage Brass Lens Flange 319 mm US $29.99
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 RUBBER LENS HOOD 8PT STAR FILTER FOR CANON T2I 550D US $13.49
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 RUBBER LENS HOOD CLEANING KIT FOR CANON 400D 450D US $9.99
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 52mm CPL fader adjustable ND2 to ND400 filter lens for Pentax K20D K200D US $21.49
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 RUBBER LENS HOOD BUBBLE LEVEL FOR CANON EOS T2I 550D US $14.99
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 Vintage Brass Lens Flange 325 mm US $29.99
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 Macro 042x Fisheye Lens f Nikon D100 D200 D80 D40x D60 US $34.95
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 TA 11 Lens Mount Adapter for Leica Screw Mount Cameras US $15.00
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 Industar 61 L D 28 55 Russian Lens M39 Fed Zorki Leica US $17.99
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 58mm UV Lens FilterCapHood for Canon 1000D 400D 450D US $6.99
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 20X Rear Lens Cap for Pentax M42 Screw Mount Camera NEW 20pcs US $16.79
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 Cimark MC Auto Zoom 140 56 f70 210mm 52Ø US $20.00 |
 16mm Bolex C to Panasonic G1 GH1 micro 4 3 adapter E P1 US $17.32
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 CHINON Lens Collection 3 Lenses Tomioka M42 Screw Mount GOOD US $190.00
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 Nikon Nikkor AF D 20 mm F 28 Lens For Nikon PARTS US $25.00
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 TELEWIDE ANGL LENS FOR JVC Everio GZ MG130305mm 305 US $29.90
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 Nikkor Qc F 135cm 135 Nippon Kogaku Case Cap US $199.99
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 New M42 Lens to Canon EOS Camera 50D 40D 5D 7D Adapter US $12.48
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What kind of adapter would I need to get a telephoto lens to mount my pentax k100?
The telephoto is also a pentax, but it has an extra part that will not allow it to screw into the Lens Mount.
The earlier Pentax lenses used an M42 screw mount. You should be looking for a Pentax PK-M42 Lens Adapter or some similar title. Try eBay or an online second hand dealer.
I cannot tell you what limitations you will have. Your manual should tell you what these are. Clearly don't expect auto-focusing, but what else, don't know.