Helios-44 2/58 M39 (serial no. 6057055). • Mount: M39 (for SLRs via adapter). • Focal length: 58 mm. • Format: 35 mm. • Filter thread: 49 mm. • Minimum focus distance: ~0.5 m. • Aperture blades: 8. • Minimum aperture: f/16.
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