Canon 6D with Leitz 2x Extender and Angenieux 70-210mm

This provides a 140-420mm zoom capability with max open aperture of f8. The 6D's remarkable noise reduction features and high ISO compensates for the aperture restriction caused by the extender - lengthening the life of this superb lens in the process! A $20 Hong Kong conversion collar to use this lens with my old Canon 50D, works just as well on the Canon 6D. More modern conversion collars provide accurate focus indication in-camera.
Image taken with Leica Digilux - the original Leica Digital.