Regis wrote:
If I can handle the Canon II DO f4 lens at 73, then most photographers will enjoy this great lens. They are coming out with a 600mm DO lens in less than a year, but it will be very expensive. About $14,000 to $17,000. I don't have the weight or specifics, but it should be about the same size as the 400 DO. I saw a picture of a mock-up of this 600mm DO. Stay tuned.
I will definitely stay tuned, but that kind of price is a bit more than I'm willing to pay. I hope to soon be using the 400 DO with a 1.4 t TC on a Canon 7D mk II. That gives me about all the magnification I need. I hand hold most of the time anyway.