Upload & Sell: Off
Patrick: Thank you for the quote from earlier. I had missed it.
Unfortunately, a 200-560mm f/4-5.6 lens would be more limiting for me than my current series I 500 f/4 with either one TC or the other attached. I had thought about selling the 500 and making the move. Now, probably not, due to the projected cost of the new lens. I will be asking CPS for the loan of one of them as soon as possible, however. Probably late next summer would be the earliest they'll be available. Time to start bugging them.
I'm sure someone will very quickly mount and test a non-Canon TC on the new lens soon after they are available as well. I don't have a non-Canon TC but if I get my hands on a loaner, I'll find one to try out ASAP.