The “swirley bokeh” is an outstanding feature of this lens. This means that out-of-focus highlights in the background are subdued and at the same time rendered in a circular fashion.
Its sharpness at the center in conjunction with a dramatic swirl bokeh is legendary. At open aperture the Biotar 75 is as sharp as can be in the center of the image and it renders the famous and sought after swirling bokeh to the side. The feel of the image is somewhat delicate which generates great contrast in available light situations with clear shadows and lights in the background.