I'm going to go with fish eye effect from the wide angle lens, since your exif is reporting at 18mm focal length. I'm not sure what you can do to make it less extreme besides using a different focal length. I don't know if there's some lenses that are worse for it than others with the same focal length.
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But Mom, Pentax IS rebellious
Pentax K-7, K20D
Pentax SMCP-FA 35mm f/2.0 AL -- Pentax SMC 50mm f/1.7 -- Pentax DA 50-200mm f/4-5.6 ED -- Sigma 28-70mm f/2.8 EX DG IF Aspherical -- Pentax DA 18-55mm f/3.5-5.6 WR
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