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I dont want to add to the confusion, but. If this is helpful then great, if not just disregard. This is wot I did...
200mm f/2.8L II USM (reported to be a very good prime lens). With APS-C sensor, equivalent FL 320mm (+60%). For birding, that is, birds in flight, sufficient FOV to follow a moving bird. Excellent 3rd party opinions regarding AP usage.
Plus 2x extender - latest version (earlier versions reported not as good).
BTW I use a 100mm macro for everything below this. And it does nice wide field AP - very sharp.
This may be too inflexible for you. My requirements are quite specific. And for me, more cost effective than owning a refractor of similar size.
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