Emphasis was laid on the resolving power of this lens at very close shooting distances. Close-up photography of up to 1:2 is possible without any accessories. 1:1 size photography is possible with the use of the Extension Tube FD 25. The exposure is automatically corrected. This lens is indispensable for close-up photography and copy work. SPECIFICATIONS: * Type: standard/macro * Angle of view: 46 degrees * Minimum Aperture: F/22 * Closest Focusing Distance: 8.1in * Filter size: 55 * Lenshood: none necessary * Length: 1 5/16 in * Weight: 11oz.