Nikon Teleconverter TC-301 2X for Nikon AI, AIS (Nikon F mount) For lenses over 300mm (USED)

(USED - Good Condition) The Nikon TC-301 2x Teleconverter is a premium manual-focus teleconverter specifically engineered for Nikkor AI and AI-S telephoto lenses with focal lengths of 300mm and longer. It features a unique protruding front optical element designed to seat deep inside the recessed rear chambers of long telephoto lenses, effectively doubling their focal length while reducing light transmission by two full f-stops. Core Technical SpecificationsFocal Length Multiplier: 2.0x (transforms a 300mm lens into a 600mm lens)Light Reduction: Loses exactly 2 f-stops (e.g., an f/2.8 prime lens becomes an f/5.6 combination)Optical Construction: 5 elements in 5 groupsLens Mount & Coupling: Nikon F-mount with AI-S indexing supportFocusing Type: Strictly manual focus