HELIOS-44M 2 / 58mm Lens for ZENIT M42 Nikon M 42-AI Adapter - Etsy Canada
MC HELIOS-44M-4 58mm 1:2 lens information and sample photos - Nikon Rumors
Helios 44/2 on Nikon F mount infinity focus achieved without extra glass adapter | Nikon DSLR and M42 lenses (all Nikon DSLR from 2006 onwards) | Flickr