The Sigma APO Teleconverter 2x EX DG for Canon is a dedicated lens accessory designed to double the focal length of select telephoto lenses. It sits directly between a Canon EF-mount DSLR body and a compatible telephoto lens, instantly converting a lens like a 300mm into a 600mm.
Key Technical Specifications:
Magnification Power: 2.0x (doubles the focal length)Light Loss: 2 full f-stops (e.g., an f/2.8 lens becomes an f/5.6 lens)
Optical Design: 6 elements in 5 groups, including 2 Special Low Dispersion (SLD) glass elements
Lens Coatings: Multi-layer DG coating optimized for digital sensors to minimize flare and ghosting
Minimum Focus Distance: Remains exactly the same as the master lens, increasing your maximum magnification ratio
