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However, full AF operation is only possible with lenses with open aperture of f/4 or brighter. Please be aware that AF will work properly only if there is enough light and contrast on the subject to activate the camera's AF sensors. Note 1. Not compatible with Canon EF-S lenses, e.g. 18-55 f/3.5-5.6, 17-85 f/4-5.6, 60 f/2.8 macro. 2. Not compatible with Canon EF 135mm f/2.8 Soft focus lens. 3. It will not auto focus with the following Canon lenses: Canon EF 50mm f/2.5 Macro, Canon EF 100mm f/2.8 Macro, Canon EF 85mm f/1.8 USM, Canon EF 300mm f/4 IS USM. 4. May not be 100% compatible with non-Canon lenses such as Sigma, Tokina & Tamron lenses. |