Lens construction : 5 elements in 3 groups
Focal length : 1.4x that of a master lens
Aperture coupling range : F2.8 - F32
Reproduction ratio : 1.4x that of a master lens
Dimensions : 68.5 X 19.5mm / 2.7in. X 0.75in.
Weight : 143 g / 5oz.