Canon EF 200mm f/2.8L II released in 1996 to update the version I lens and replaced the built-in hood with a snap on hood but otherwise they are similar lenses
a favourite amongst astrophotographers on APS-C cameras
mark II is overdue for a replacement to address lack of weathersealing, no rounded aperture blades, and is less sharp than a 70-200mm zoom but at least it is less than half the price and weight
excellent coma - this is why astrophotographers love it!
mild astigmatism 7.6%
not quite as sharp as the Canon EF 70-200 mm f/2.8L IS USM II but much lighter, smaller, cheaper and better vignetting, flare and slightly better CA and distortion
bokeh can be nervous at transition zones and can give cat's eye oval shapes