|Canon RF 600mm f/11 DO lens|
|Canon RF 800mm f/11 DO lens|
Canon will be announcing two RF long lenses very soon. The RF 600mm and RF 800mm will feature a DO element and boast between 4 and 5 stops of image stabilization. The 800mm lens is made up of 11 elements in 8 groups and weighs 2.78 lbs (1260 g) while the 600mm is made up of 10 elements in 7 groups and weighs about 2.0 lbs (930 g).
The RF 600mm length is 7.8 inches (199.5 mm) when retracted and 10.6 inch (269.5 mm) extended for shooting. The RF 800mm will be 11 inches (281 mm) retracted and 13.8 inches (351.8 mm) extended for shooting. Both lenses are very slow with a minimum aperture of f/11 and have a list price of around $700 to $900 respectively.
I am a fan of Canon's Diffractive Optics lens technology, like the EF 400mm f/4 DO IS II, for wildlife photography but find it puzzling what these new cheap RF long lenses are good for?