The optical part probably looks familiar enough. The acclaimed Nikkor PC 4.0/19. We made it available for use on Cambo WRS and Phase One XT cameras. The lens has been rehoused and fitted with a controller for the electronical aperture. The image circle is large enough to cover the sensor of an IQ3/IQ4 back and still permits about 4mm of shift. Edge-to-edge sharpness is excellent.