Helios 44–2 lens for Nikon F mount | Yeah, nah, aye
Helios 44-2 M42 Russian Lens for Nikon Cameras Not Used Like New : Electronics - Amazon.com
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
Helios 44-2 lens with anamorphic bokeh & flare streaks for M42/SonyE/Canon/M43rd | eBay
Helios 44–2 lens for Nikon F mount | Yeah, nah, aye
ZENITH Helios 44m (M42) to Nikon F Mount Conversion. : 15 Steps - Instructables