What happens when you put a 600 or 800mm f/11 lens on an APS-C R-body? 1280mm field of view, in the latter case. That's pretty cool. I wonder about how image quality would compare to using a 1.4x or 2.0x teleconverter on a shorter lens.
Given I can shoot at almost 1000mm in crop mode on my R5 at f8 using the 100-400L II and a 1.4X III and get great results, the 800mm f11 with it's 22 foot minimum focal length fell completely off the interest scale.
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