The M42 adapter used on Nikon F can make a huge difference: Adapted Lens Talk Forum: Digital Photography Review
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Amazon.com : M42-FD M42 Lens Adapter Ring, M42-FD M42 Camera Adapter for Canon FD F-1 A-1 T60 Function of Focusing Infinity : Electronics
![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 on Nikon F mount infinity focus achieved without extra glass adapter | Nikon DSLR and M42 lenses (all Nikon DSLR from 2006 onwards) | Flickr](https://farm9.staticflickr.com/8289/7876238520_6ae0d62e47_z.jpg)
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
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Amazon.com : Fotasy Copper M42 Lens to Cannon EF Adapter, 42mm Screw Mount Lens to EFs, Infinity Focus, Compatible with Canon DSLR 6D 5D Mark IV III II 1Ds 1D 7D II
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M42 lens Adapter Ring M42-AI Glass for M42 lens to Nikon Mount with Infinity Focus Glass DSLR Camera d3100 d3300 d7100 - AliExpress
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M42 - AI Lens for Nikon AI Mount Adapter Converter Optic Focus Infinity (with glass) Lens Ring - AliExpress
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adapter ring Infinity Focus with glass for M42 Lens to nikon d3 d5 D90 D80 d500 d600 d800 D5000 D3000 D3100 d7200 camera - AliExpress
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