Canon 65mm MP-E F2.8 1-5x MF Lens;

The Canon MP-E 65mm f/2.8 1-5x Manual Focus Macro Lens with Tripod Mount Ring is a unique manual-focus lens designed exclusively for macro shooting, between life-size (1x) and 5x life-size at its maximum magnification, you can fill a 35mm frame with a grain of rice. Compatible with the Macro Ring Lites and new Macro Twin Lite and it's fully compatible with 6D, it eliminates the need for awkward bellows accessories for many macro shooters. The optical system uses a floating system to preserve optical quality at different focusing distances, and features a UD-glass element.