Although the ubiquitous 50mm standard lens has largely given way to the kit zoom as a first purchase, it still has a very important role as a light, bright optic with a special value in low light photography. The SMC Pentax-FA 50mm f/1.4 is one of the few survivors of full frame Pentax lenses from the film era. It has been reported as discontinued many times over the years, but has continued to be available. Now it has a new lease of life with the K-1 full frame body, so it will be very interesting to see if this 1991 design is up to scratch compared with the excellent new zooms now appearing.
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https://www.ephotozine.com/article/smc-pentax-fa-50mm-f-1-4-review-29443