Hi
Thought about an FS60Q? I have the FS60C at F5.9, 354 MM, but with the Q module which is effectively a Barlow at 1.6x, that puts it into your ball park though at F10. With the Q attached, you get a very flat image. it's really very good.
Again, breaks into 2 parts so great for hand luggage.
Just a thought
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