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Amazon.com : Fotodiox Designer (Clear) Rear Lens Cap Compatible with Nikon F-Mount Lenses (Non-AI, AI, AIS, AF, AFD, AFS, G, DX, FX) : Camera Lens Caps : Electronics
Calculating focal length conversion, DX -> FX, FX -> DX: Nikon SLR Lens Talk Forum: Digital Photography Review
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