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pentax * (fa*, da* etc.)

The star sign follows the lens series designation (e.g., A*, FA*), and denotes a high-performance lens that uses special-glass elements

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pentax * (fa*, da* etc.)

A lens that uses one or more aspherical elements (aimed at achieving flat field and corner sharpness with wide-angle lenses).
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pentax * (fa*, da* etc.)

Current series of lenses optimised for full frame dslrs.
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pentax * (fa*, da* etc.)

Current series of lenses designed for DSLRs with APS-C sized sensors.
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pentax * (fa*, da* etc.)

Like DA, but featuring a very light construction, thus optimally paired with very compact and light bodies like the K-m.
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pentax * (fa*, da* etc.)

A lens that uses extra-low dispersion glass elements (aimed at reducing color aberrations in telephoto lenses).
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