• UPDATE



    The forum will be moving to a new domain in the near future (canonrumorsforum.com). I have turned off "read-only", but I will only leave the two forum nodes you see active for the time being.

    I don't know at this time how quickly the change will happen, but that will move at a good pace I am sure.

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Like the title says...upgrading from Trusty 5DIII to an R5. I will need to buy the adapter for existing 28-105L, 16-35L, 100 Macro.
I also have a 70-200 f/4L mk i that I am I am looking to upgrade that to either 1. EF100-400 mki, 2. EF100-400 mkii), or 3. the RF100-500.

I intend to sell both 5Diii and 70-200 to defray some cost which isn't a huge factor, but there is a large gap ($1000-$3000) in price between a nice used 100-400 mki and the 100-500. I have used a rented 100-400mk1, and it's a great lens...thoughts?