Out of my frustration with the Panasonic 100-300 I decided to try some old manual lens to get some extra speed. I bought a cheap one, the Canon FD 400/4.5, to see if I could handle it. It's an old one, according to the serial number it's made in 1975. Pros and cons: + Fairly light + Cheap + Very handy slide-out lens hood + f/4.5 is faster than f/5.6 - Just like the 100-300 it has to be stopped down to f/8 to get really sharp. - LOTS of CA. Especially lots of longitudinal CA, and especially wide open. They call Oostvaardersplassen the Serengeti of Europe, but the largest predator I see is a fox. Where are the lions?