ZENITH Helios 44m (M42) to Nikon F Mount Conversion. : 15 Steps - Instructables
Helios 44–2 lens for Nikon F mount | Yeah, nah, aye
Amazon.com : Fotasy Adjustable M42 Lens to Nikkor Z Mount Adapter, M42 Z Mount, fits M42 42mm Screw Mount Helios Lense, Compatible with Nikon Z Mount Mirrorless Camera Z30 Z50 Z5 Z6
ANAMORPHIC Helios 44-2 2/58 adapter Nikon Canon Mikro 4/3 Sony E Nex Fudji X | eBay
M42-Nikon Adapter Ring with Glass. Quality Test. Lensbeam
Autofocus MC HELIOS-44M-4 58mm 1: 2 | Happy
Mod: Autofocus Helios-44 for Nikon pt2 | Richard Haw's Classic Nikon Repair and Review
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
HELIOS-44M PETZVAL Mod Lens +adapter Sony Canon Micro 4/3 Nikon Fujifilm /CLA | eBay