Canon Extender EF 2X III

Canon Extender EF 2x III Extender • Product Type: Teleconverter / Lens Extender • Mount: Canon EF • Magnification: 2.0× • Lens Construction: 9 Elements in 5 Groups • Built-In Microcomputer: Yes • Fluorine Coating: Yes • Dust & Water-Resistant Construction: Yes • Marketed: December 2010 Focal Length & Aperture • Focal Length Magnification: 2.0× • Example: 300mm → 600mm • Example: 400mm → 800mm • Maximum Aperture Reduction: 2 Stops Optical Design • Lens Construction: 9 Elements in 5 Groups • Optical Design: Optimized for compatible Canon telephoto and super-telephoto L-series lenses • Chromatic Aberration Control: Optical design helps minimize chromatic aberration and colour blurring • Flare & Ghosting Control: Optimized lens positioning and coatings help minimize flare and ghosting • Fluorine Coating: Helps resist fingerprints, smears, oil and soiling Electronic Communication • Built-In Microcomputer: Yes • Lens-to-Camera Communication: Supported • Focusing Data Transmission: Supported • Metering Data Transmission: Supported • Lens Data Transmission: Supported Autofocus • Autofocus: Depends on the combination of lens and camera body • AF Performance: Compatibility and available AF functions vary depending on the attached lens and camera Compatible Lenses • Designed for Selected Canon EF L-Series Telephoto Lenses • Designed for Selected Canon EF L-Series Super-Telephoto Lenses • Not Compatible with Every EF Lens • Lens & Camera-Specific AF Limitations May Apply Construction & Protection • Improved Lens Mounting Design: Yes • Fluorine Coating: Yes • Dust-Resistant Construction: Yes • Water-Resistant Construction: Yes • Professional-Oriented Design: Designed for demanding telephoto photography Dimensions & Weight • Maximum Diameter: Approx. 72.0mm • Length: Approx. 52.7mm • Dimensions: Approx. Ø72.0 × 52.7mm • Weight: Approx. 325g Accessories Canon's official EF Lens accessory chart specifies: • Extender Cap: Extender Cap E II • Lens Case: LP811