Focal length : 55.8 mm
Aperture range : f/2 to F/8
Aperture scale : 2, 2.8, 4, 5.6 and 8
Lens construction : 8 elements in 6 groups Standard magnification : 1/4X
Picture angle : 8.2 degrees
Standard wavelength : 404.7 nm (h-line)
Vignetting : 0% at f/2
Distortion : +0.01%
Aerial resolving power : 650 lines/mm
Object area : 40mm⌀
Image area : 10mm⌀
Overall working distance : 12.4" (315mm)
Filter size : d=40.5 mm
Mount : Leica L39 screw mount
Weight : 11.46 oz (325 g)