Many photographers perfer this focal length for photomacrography, since it gives them twice the working distance as a 50mm lens for the same reproduction ratio. This allows more room for lighting equipment and more distance from sensitive subjects.
This lens incorporates into the helical focusing mechanism, a special friction damping device, to prevent unwanted focus changes when used in vertical applications.
Construction: 5 elements in 3 groups
Angle of view: 24 degrees
Minimum Aperture: F/32
Closest Focusing Distance: 1ft 6in w/FD50-U
Filter size: 52
Lenshood: optional BT-52
Length: 3 3/4 in