This lens is an EF 50mm f/2.5 Macro.

Features

• Focal length and maximum aperture: 50 mm 1:2.5
• Lens construction: 9 elements in 8 groups
• Diagonal angle of view: 46°
• Focus adjustment: Front group linear extension system with AFD
• Closest focusing distance: 0.23m / 0.8ft
• Filter size: 52mm

Light and compact, it functions beautifully as a general-purpose normal lens

Lightweight and compact macro lens for close-ups up to 0.5x. Floating system for superior delineation at all focusing distances. With a large f/2.5 aperture, true and beautiful background blur is possible. Multi-purpose lens for portraiture and other applications besides macro photography.