The Canon EF 70-300mm f/4-5.6L IS USM Lens Review has been updated to include Canon EF 1.4x III Extender and Canon EF 2x III Extender compatibility information including ISO 12233 Resolution Chart results. Here are the details: The Canon 70-300 L is officially NOT compatible with Canon extenders. I've tried mounting Canon extenders to the 70 A better combo would be the Canon 400mm f/5.6 with Canon 2X TC or the Canon 300mm f/4 IS with Canon 2X TC. These combos offer faster AF in many situations and offer similar or superior sharpness. With all this said I find the Tamron the best tool for the things I shoot (birds, sports) when I need the reach of a 400mm+ lens. High-Quality Optics. The Canon EF Extender 2x III features five groups/nine elements that ensure improved optical performance. All optical elements use Canon’s super-spectra coating, which reduces ghosting and flare to minimize post-processing requirements and a fluorine coating on the front and rear elements makes smudge marks much easier to clean. Contax N mount lenses modified to Canon EF by Conurus. Contax 645 NAM-1 adapter modified to Canon EF by Conurus. Sigma, Tamron and Tokina lenses in Canon EF mount (see note 3) Lens correction such as peripheral shading, CA and distortion. Focus confirmation "chip" (e.g. Dandelion) Stacking another lens mount adapter on top (see note 4) Lens The 200 + Extender shows up a shallower DOF than the 200 w/o extends. Thin like shots with a macro lens. The 70-200 is more versatile regarding DOF. Check out the corresponding 300% crops! 1st set: 70-200 2,8 L I + 2x Ext III - 5DMkIII shot 400mm. Make. Canon. Model. Canon EOS 5D Mark III. . Canon 7D Mark II w/Canon BG-E16 Battery Grip; Canon EOS 50D w/Canon Battery Grip; Canon SL1; Tokina 12mm - 24mm f/4 PRO DX II; Canon EF 24-105mm f/4 L IS; Canon EF 70-200mm f/2.8 L IS; Canon 70-300mm f/4-5.6 L IS; Sigma 85mm f/1.4 EX DG HSM; Canon EF 300mm f/4 L IS; Canon EF-S 18-135mm f/3.5-5.6 IS STM; Canon Extender EF 1.4x II; Canon Extender The 200 + Extender shows up a shallower DOF than the 200 w/o extends. Thin like shots with a macro lens. The 70-200 is more versatile regarding DOF. Check out the corresponding 300% crops! 1st set: 70-200 2,8 L I + 2x Ext III - 5DMkIII shot 400mm. Make. Canon. Model. Canon EOS 5D Mark III. The Sigma APO 1.4x tele-extender is a perfect companion for this lens, converting it from F3.4 to 280mm F5. The image remains outstanding, and the focal length range is ideal for wide angle astrophotography of extended objects. I have used this tele-extender with equally good results on a Pentax SMC 135mm lens, and TSAPO65Q and TSAPO100Q Sigma's dedicated 2x APO teleconverter can be mounted between select lenses and the camera body to increase the focal length by the power of 2.0x. The new multi layer coating reduces flare and ghosting, which is a common problem with digital cameras. They demonstrate best performance with DG series lenses. It also offers maximum photography High-Quality Optics. The Canon EF Extender 2x III features five groups/nine elements that ensure improved optical performance. All optical elements use Canon’s super-spectra coating, which reduces ghosting and flare to minimize post-processing requirements and a fluorine coating on the front and rear elements makes smudge marks much easier to clean.

canon extender ef 2x iii compatible lenses sigma