The Pentax DA 40mm f/2.8 XS Lens is specifically designed for the APS-C sized Pentax K-01 mirrorless camera. The 40mm focal length is equivalent to 61mm on a 35mm format, and provides a slightly longer angle of view than normal. It features a maximum aperture of f/2.8 for low and existing light photography and greater control of depth of field. In addition to the wide aperture, the 9 rounded aperture blades help to provide a smooth bokeh that is accentuated in the highlights when photographing wide open.

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