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This Extension Tube provides 50mm of extension for any Canon FD mount lens while providing full FD lens function: AE operation with AE cameras and automatic diaphragm operation with other Canon SLR's.
Canon's Screw Mount 50mm f/1.2 is a compact, super-sharp, high-speed all purpose normal lens. Based on the 50mm f/1.4 design and built to professional standards, this lens can be used with respectable results even at its maximum f/1.2 opening.
This lens has has oil on the aperture blades.
Compact, High-speed normal lens for Canon manual focus rangefinder cameras
Light weight for a 50mm f/1.2 at 11.7 oz (334g)