Overview

The Pentacon 300mm f/4 is a large, heavy lens (about 5 lbs) designed for medium format, with a 19-blade iris that produces pleasant bokeh. At f/4 it is slightly soft, but sharpens at f/5.6 and performs very well at f/8. Build quality is impressive, with excellent manual focus and aperture rings. It suits wildlife and bird photographers willing to handle its weight and use a tripod.