Industar 61 L Z 2.8/50mm SLR Russian m42 lens

Industar 61 L Z lens history. Industar-61 L/Z four m42 lenses anastigmat average luminosity with enlightened eyes. Equipped with iris, in the version for SLR cameras - more "jumping" diaphragm. MC ...

• Type Mount - M42 (for SLR cameras Zenit, Pentax, Praktica...)
• Angle of view - 46 ° 
• Focal length - 50 mm
• Relative aperture - 1:2.8
• Frame format - 24x36 mm
• Number of lenses / groups - 4 / 3
• The limits of the scale diaphragms - 1:2,8-1:16
• Near focusing limit is - 1.2 m
• The resolving power of TU (center / edge) - 40/27 lines / mm.