Just to add contrast to Jon's 'Grey' - this is the true and proper, native Squirrel, the beautiful 'Red', sadly confined to the middle top half of the UK, but with a small population on the Isle of Wight.
As you cannot calibrate mirrorless bodies the EF 2x is fractionally soft, but sharper on the 1DX MKIII. As I don't have the RF 1.4 or 2x hard to know if these may have been better.
Thanks to those who posted or viewed on the last posting.
Steve
Subject: Red squirrel (Sciurus vulgaris)
Location: UK
Camera: Canon EOS R5
Lens:EF EF500mm f/4L IS II USM +2x III
Exposure: 1/1000s at f/8 ISO4000 EV 0
Original format: Portrait, slight crop
Processed via: LRC 2021 (10.4) & PS2021 (22.05.0)