First party Pentax lenses tend to be the highest quality when compared to the similar lens designs built by Sigma or Tamron. There are some exceptions, but that's a good general rule.
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Digital: Canon 1DMkii, EF 17-40mm f/4 L, EF 50mm f/1.4, EF 85mm f/1.8
Film: Pentax LX, Pentax FA 50mm f/1.4, Pentax A 70-210 f/4, Pentax A 28mm f/2.8, Vivitar 2x Teleconverter, Vivitar 285HV
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