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Forum: Pentax SLR Lens Discussion
12-02-2012, 01:05 AM
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In the end the difference between some M and A lenses (some are optical copies) is price and aperture control (inc. exif info). Whether or not the 50-100% price premium is worth it is up to you. I have one Pentax A lens (50f1.7 - my first legacy lens) and I think 8 Pentax M/K lenses. That's mostly due to bargain shopping on Ebay and not willing to pay the higher prices of A's. However I will definitely sell my M50f1.7 before/soon and keep the A50f1.7 because the A contacts are worth it to me.
Regarding the difference the 50f1.4 and the 50f1.7: I don't see any reason to own both unless you are a collector or you are trying to get the last 1% out of your photos. The one difference that is easy to see is the Pentax A50f1.7 produces a 6 sided star vs an 8 sided star (50f1.4) when shined at a bright light source. I don't have a 50f1.4 but the star is just as sharp but obviously 8 sided. The 55f1.8 is similar to the 50f1.7 in this respect but my copy (takumar) doesn't produce as sharp of a star.
A50f1.7
Old Hanshin Mall, Lantern Festival, Kaohsiung, Taiwan by abacus07, on Flickr
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