I decided to bring an old EOS lens out of retirement to see how well it performs on a modern camera.
Gear: EOS 5D Mark IV, 600EX II-RT, EF 70-210mm F/4, Settings: Tv: 1/20th , ISO: 400 , Av: 8 @ 140mmGear: EOS 5D Mark IV, 600EX II-RT, EF 70-210mm F/4...