The one perfect lens
If I had to chose a single lens and no others, this would probably be it. The substantial, solidly-built Pentax P-FA 50mm 1.4 is fast and sharp. It autofocuses extremely quickly, but is easily converted to a manual lens if desired via a switch on the body. Image quality is outstanding, even magical. Moreover, the P-FA 50mm lens is compatible with Pentax 35mm film cameras as well, so if you have a Pentax ist or K1000 or any other Pentax 35 mm interchangeable lens camera you can enjoy the benefits of this 50mm lens in the gooey, gorgeous analog context of film (I have yet to use mine this way--but will soon). Remember that this can not be said of all "digitally optimized" lenses from Pentax which usually lack an aperture ring, and really only work with Pentax APS -C digital cameras (so not 100% backward compatible, unlike the P-FA 50mm 1.4). To get this kind of flexibility, speed and quality in another Pentax lens product you would probably buy a Limited lens for around $1,000 and up. This 50mm is a bargain in comparison. One thing I noticed is that this lens looks different then other available Pentax lenses. I would not be surprised if it is not fazed out in favor of newer but less flexible and desirable glass--other 50mm products are being introduced by Pentax but these are slower and less flexible than P-FA 50mm. I would strongly recommend picking up a 50 mm now if any of these qualities interest you.
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