This is a cool lens with about twenty aperture blades and a circular aperture for beautiful bokeh. It is preset, meaning that you set the aperture on the front ring and then rotate the second ring to close the aperture for exposure.
This is a T mount lens with a Pentax m42 adapter. The lens also includes a removable 2x Teleconverter. The lens is in excellent condition with light wear and works perfectly. The glass is clean and scratch-free and everything works perfectly. The leather case is included.