Canon discontinues one of the best Macro lenses ever!
Amazon.com : Canon MP-E 65mm f/2.8 1-5X Macro Lens for Canon SLR Cameras : Camera Lenses : Electronics
Field Test: Canon MP-E 65mm f/2.8 1-5x Macro | Popular Photography
Canon 65mm f2.8 MP-E 1-5X Macro - Lens
Macro photography focusing rails for stacked focus, especially with Nikon macro lenses or Canon 65mm MP-E f2.8 macro lens with 5X enlargement | Digital Photography
MACRO photography with the Canon MP-E 65mm 1-5x macro lens - lens review - YouTube