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
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Lens Adapter Ring for M42 Lens to Nikon Mount Adapter with Infinity Focus Glass for Nikon D60 D80 - Walmart.com
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M42 - Nik F For M42 (42x1) lens Nikon F mount camera D6 D750 D850 Mount Adapter Ring M42-AI Correction Glass Focus to infinity - AliExpress
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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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