TC 20E III AF S Teleconverter Enhanced Telephoto Versatility Affordable and portable gateway to extend telephoto reach ideal for sports, wildlife, surveillance and more. 2x Optical Conversion Factor Doubles the focal length of select compatible NIKKOR lenses. Aspherical Lens Element. Virtually eliminates coma and other aberrations, especially at wide apertures Nikon Integrated Coating IC Enhances light transmission efficiency, improves color consistency and reduces flare. Advanced Optical Design 7 elements in 5 groups optimized for use with FX and DX digital SLRs, engineered to meet the needs of professional photographers.
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