A portrait of a bird with a 600mm lens, so can we say it's not a full frame body ? So a 7D mk II looks more realistic Of course we ignore the distance between this guy and the bird but...
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patent 300mm F/4
Focal length f = 294.0mm
Fno = 4.14
= 8.42deg angle.
15 sheets 11 groups configured
One element radial refractive index profile
Bowen ratio 0.78
Inner Focus (the second lens group for focusing)
The 300/4 isn't a sealed lens