The high performance Beseler 45M Condeser Lightsource for the 45V utilizes Beseler's patented "Cone-of Light" variable condenser system to adjust the position of the over-sized 6-1/2" optical glass condensers to maximize the illumination for every format 35mm through 4 x 5", yielding exceptionally short exposure times, a cooler film stage and less negative buckling than with conventional condenser heads.