Quick 'stomp' around Lee Valley Country Park this morning - not a lot of activity but happy with a few I got. Put the 2x extender on from the start and my personal opinion - YES it really does work surprising well.
Testing birds in flight and against busy backgrounds to see how the 2x worked - can say it's a LOT better than I was expecting.
Just a couple extra non birdy ones: Canal boat cat xxxxx
Back to racing next weekend so more of what I know