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The lengths some people go to! Compatible with all Pentax 645 lenses, the 2x Rear Converter-A easily and effectively doubles the focal length of whichever lens you choose. Whether you use it with the 35 f3.5 or decide to turn your 600 f5.6 into a 1200mm image grabbing monster, Pentax optics technology ensures your photos will look crisp and clear. Supplied with electrical contacts which transmit signals between the camera and the lens, it also maintains and permits the use of all automatic lens and camera functions including Programmed Auto Exposure.