The lensbaby twist 60 optic with classic metal bodied petzval design is a 60mm lens with bright f25 aperture that creates a dreamy swirly bokeh background with subtle vignetting in the corners for a timeless vintage effect true to an 1840 design by joseph petzval this lens reveals striking separation between subjects and their background making it well suited to portraits this lens is for use with sonys full frame e mount mirrorless cameras