XF 70-300 Aperture/Focal Length Ramping?

Started 4 weeks ago | Questions thread
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XF 70-300 Aperture/Focal Length Ramping?

It starts out at f/4, and it ends up at f/5.6, but how quickly does the minimum aperture close up? 
Is it between f/4.5 and f/5 at 200mm, like the 55-200?

Just idle curiosity as I wait for my local camera shop to get it in stock so I can try it out (and probably instantly buy it) myself.

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