MC HELIOS 44K-4 F2 58mm Lens Bo
keh for Bayonet K Pentax SLR DSLR camera
Format: 35mm mirror
Type: Constant focal length (fixed)
Focus: Manual Focus
System: Pentax K
Optical design: 6 elements in 4 groups
MC Helios-44-K-4 58 mm f / 2 - high-apertured, normal lens with constant focal length and multi-illumination for Pentax K cameras
TU resolution (center / edge): 42/21 lines / mm
Light transmission coefficient: 0.85
Geometrical vignetting: 58%