I am a new member to this forum so please excuse me if this has been discussed before. What are you hearing regarding an upgrade to the 100-400 f4.5-5.6? The push pull is a little outdated and it would be nice to see an upgrade.
Additionally are there plans for an l series 100-300 (or 120-300) f4.0 that might also work with the 1.4x and 2.0x converters?
Thanks for your insight.

