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M42 to Nikon Adapter.
These are top quality M42 thread to Nikon Bayonet adapters. They have black anodised aluminium body and coated optical correction element. Note that these are 'dumb' adapters; they are not fitted with chips. The single element enables M42 (Pentax) threaded lenses to focus to infinity. The correction element is removable by unscrewing the retaining ring.
