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%