When mounted on a PENTAX K-mount ILC camera body, the PENTAX-DA 50mm f/F1.8 lens delivers a focal length of 50mm or 76.5mm in the 35mm format. The lens f/1.8 maximum aperture and round diaphragm blades enable it to produce a natural “bokeh” (out-of-focus) effect, which gives the blurry elements in an image a softer, rounded and more pleasing appearance. Additionally, the f/1.8 aperture makes it possible to increase camera shutter speed when photographing in poorly lit conditions, which minimizes camera shake and helps eliminate blur.