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Lowest Price: £107.80Sony's DT 50mm f/1.8 SAM lens boasts a smooth autofocus motor (SAM), bright f/1.8 maximum aperture and lightweight construction all for around £145. It is designed for Sony's range of APS-C DSLRs and so cannot be used on a full frame camera. The SAM focusing system is compatible with Sony's cameras that rely on the lens having a motor built in to focus, such as their NEX range of cameras.