Mubashm wrote:
Bill so sorry for the late reply. Yes, I do use Canon extender 1.4(white color) with my Canon 400mm 5.6 lens. Please try that set up. This one is compatible with your lens. I have the same lens. I love this combination and always get great result. This lens is specially great for BIF photography. This picture I took last Saturday.
Thank you for your response. I never thought of trying that combination because I read it wouldn't work. You proved that to be wrong.