DA 40mm f/2.8 Limited
The smc Pentax-DA 40mm f/2.8 Limited is a pancake lens for the Pentax K-mount. At only long, it was the smallest lens made by Pentax until the 40mm XS lens was introduced. The lens has a 35mm equivalent focal length of 60mm; it is part of the Limited series of high-performance compact lenses. In August 2013 it was re-released with improved lens coatings and rounded aperture blades as HD Pentax-DA 40mm f/2.8 Limited.
DA 40mm f/2.8 XS
The SMC Pentax-DA 40mm f/2.8 XS is an even thinner version of the SMC DA 40mm lens, at thick, released by Pentax on February 2, 2012. It features an aesthetic design by Marc Newson to match the Pentax K-01. It is currently one of the thinnest autofocus pancake lenses ever made.
References
External links
DA 40mm f2.8 Limited Official product page at Ricoh Imaging
DA 40mm f2.8 XS Official product page at Ricoh Imaging
PENTAX Introduces an Ultra-Thin 40mm Lens for the Digital SLRs, press release at Ricoh Imaging Examples of images list for 40mm XS, PENTAX K-1 Laboratory Pentax DA 35mm F2.4 vs 40mm XS vs 40mm Limited Review at PentaxForums.com