Jintu T2 Lens Mount Adapter Ring For Nikon Camera D5100 D5200 D7100 D7000 D3100 D3200 D3300 D70 D80 D90 D600 D800 D300 D800 Dslr - Lens Adapter - AliExpress
M42 Lens mount adapter ring to AI Nikon F for Nikon D3400 D3300 D3200 D3100 D300 | eBay
Sony Alpha A-Mount (and Minolta AF) DSLR Lens to Nikon F Mount SLR Camera Body Adapter – Fotodiox, Inc. USA
T2/T lens Nikon F Mount Adapter Ring for Nikon D80 D90 D100 D200 D300S D300 D70 | eBay
Singing the Praises of the Nikon D300
Nikon D300 Mount Type
Amazon.com : Fotodiox Lens Mount Adapter Compatible with T-Mount (T/T-2) Thread Lenses to Nikon F-Mount Cameras : Meade Nikon T Mount : Electronics
Nikon D300 Compatibility
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Nikon D300 In-depth Review: Digital Photography Review