Canon RF 100-300mm f2.8 L IS USM Lens Key Features. Fast Dual Nano USM (video AF). Fast AutoFocus. You can combine the RF 100-300mm with the Canon RF 2.0x and Canon RF 1.4x extenders. You can achieve focal lengths of 140-420mm with the 1.4x and an incredible 200-600mm when combined with the 2.0x.
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