Great piece on actually using the Canon 1,200mm f/5.6.
As I read, I can't help but think about how far optics and lens technology have come in the last couple of decades. Today, I could put the EF 600mm f/4L IS II on my 7D MkII and add the EF 2.0x TC-III and HAND HOLD a shot of the moon at an "effective reach" of 1,920mm at f/8.0!