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
Fixing the focus to infinity issue of the Helios 44-2 on M42 to Nikon F mount adapter - YouTube
Rent a Helios 44-2 58mm F2 Lens w/ EF adapter, Best Prices | ShareGrid Los Angeles, CA
Review: The Helios 44-2 58/2 Lens in M42 Mount – davidde.com
Helios 44-2 58mm M42 Lens to Leica L/T Mount Adapter fits Leica TL2 TL CL SL 662578165989 | eBay