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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 : Fotodiox Lens Mount Adapter with Infinity Focus, M42 (42mm x1 Thread Screw) Lens to Nikon Camera, for Nikon D1, D1H, D1X, D2H, D2X, D2Hs, D2Xs, D3, D3X, D3s, D4, D100,
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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
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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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M42 - AI Lens for Nikon AI Mount Adapter Converter Optic Focus Infinity (with glass) Lens Ring - AliExpress
The M42 adapter used on Nikon F can make a huge difference: Adapted Lens Talk Forum: Digital Photography Review
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