[Brightcolours]

This is an early spring morning 500mm (f8) "macro".
The lens itself (55BB model code) does not quite offer this magnification (it goes down to 1:3 at 1.7 meters MFD) so a little extension tubing was required. I can totally see myself using 600mm or even 800mm to get narrow FOV and depth compression for "close ups".
You'll need quite some extension tubing with these 600mm/800mm Canon lenses to get similar magnification.

By the way, the specs do seem legit.. The EF 800mm f5.6 L IS USM also has a 6m MFD, and also gets 0.14x max. mag. And 600 / 800 = 0.75 x 6m = 4.5m. Checks out perfectly.