This Helios 44 has the same optical block of previous lenses but has a special construction with detachable optical block. This lens has a pre set diaphragm and is intended to be used as a normal or macro lens for reproduction purposes. Without its focusing helicoid the lens is applied on the "PZF" bellows and focus continously from infinity up to 1.5:1 Macro giving a higher image than real object. Production of BelOMO.