I have used this lens maybe 5 times. LIKE NEW Highlights EF Mount Lens 0.5x Maximum Magnification Macro Focus Aperture Range: f/2.5-32 Floating Optical System Distance and Depth of Field Scales Minimum Focus Distance: 9.1" 6-Blade Circular Diaphragm Optional Converter for 1:1 Macro Filter Thread Diameter: 52mm Features This EF 50mm f/2.5 Compact Macro Lens from Canon is a lightweight and compact 50mm macro lens for general-purpose standard focal length shooting and for close-up 1:2 half life size macro photography. A floating optical system enables sharp delineation at all focusing distances. With a large f/2.5 maximum aperture, the lens is effective in low light and provides shallow depth offield and its truly circular 6-blade diaphragm offers beautiful background blur. An optional Life Size Converter EF enables focusing to a true macro 1:1 reproduction ratio.