Reviews and Problems with Pentax SMC DA 40mm F2.8 XS
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REVIEW: Pentax DA 40mm f/2.8 XS Pancake
28 March 2012
Excerpt: This compact pancake lens, released with the Pentax K-01 camera has a bright maximum aperture of f/2.8 and is currently the thinnest interchangeable fixed focal length lens compatible with an APS-C format camera, being under a centimetre thick.