The 8 inch Pentac lens is known for its "bokeh", which is a Japanese term which means the quality of the out of focus areas. The lens is uncoated and will provide nice highlights but less contrast than modern lenses. To increase contrast you may use a lens shade. This lens has become favourite among the alternative photography crowd and those who are interested in non-digital, personal contemporary photography.The Pentac was designed by L. B. Booth for Dallmeyer and came to market in 1920. It is a 5 elements in three groups lens in the same design family as Voigtländer's Heliar.8" Pentacs were made for the RAF during WWII by a number of lens plants.