Scrumhalf wrote in post #18305415
I'm waiting for the 600 DO to come out. The 500 II is eminently hand holdable and I don't want to give that up, even though the extra 100mm is seductive. But yeah, the 500 and 600mm are works of art.
I went to the 2017 Photography show at the NEC Birmingham on Saturday, Canon had a huge area where you could try all their gear. Being interested in the big whites myself a Canon Rep said that the coming 600 f4 DO BR will be a vast improvement on the 600 f4 II. It will incorporate Blue spectrum refractive optics that will completely eliminate CA. He said that its main feature being a reduction in size and weight.
Thinking about this it would be a much desired lens as it would be easy to take on planes and transport, but most importantly hand holdable for BIF. Big question is how much??
This probably explains why there were big reductions at the show for the 600 f4 II.