Kenko 1.4X 300 Pro Extender
Any time. Yeah price point is a huge difference between the Kenko and Canon. I will say one thing whether you decide on the Kenko or go with a Canon, try several if needed to get one that best matches your lens. While mine is super sharp with these two lenses it is totally horrible with my Sigma 120-00 f2.8 OS HSM.
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