Works verry good with the 300 mm F2.8 L IS USM II and the 70-200 mm F2.8 L IS USM II . Sharp pictures and AF works excellent. http://www.panoramio.com/user/971669 http://www.hdr-photography.be
Cons
Works verry good with the 300 mm F2.8 L IS USM II and the 70-200 mm F2.8 L IS USM II