I understood the af would be an issue but it doesn't produce clear pictures. used with d40x with a 70-300, d40x &18-55. no autofocus at all on these pictures fuzzy on tripod. used with d200x and 200-400 af worked fine but fuzzy pictures. used with d2x and 300mm 2.8 on tripod. af worked but pictures still fuzzy. not worth the 15% restock fee and shipping to return it.