|Canon 600mm f/5.6 DO lens|
|Canon 800mm f/5.6 DO lens|
Egami, the Photography Blog in Japan has discovered more patents filed by Canon Inc. This time it is for the 600mm f/5.6 and 800mm f/5.6 DO lenses. It comprise of 17 elements in 10 groups. Although Canon has recently introduced the Series II 'white lenses', the current 600mm f/4 and 800mm f/5.6 are quite large lenses weighing in at 8.65 and 9.86 pounds respectively.
Canon Japan files many patents, that does not mean they will turn them into production models but it will be very welcomed, especially by me, to have a EF 600mm f/5.6 DO lens in my equipment bag. Diffractive Optics (DO) makes the lens shorter and weigh less, as evidenced by the Canon EF 400mm f/4 DO lens. This is one of my favorite lenses and weighs just a little over 4 pounds. Visit my website MichaelDanielHo.com to see the lens and photos taken with the EF 400mm f/4 DO lens.