Tolerance to CA is a personal thing. Depending on what you are observing there will be times when you don't see any at all such as lower powers and deep sky. It will be worst on very bright objects like Venus, Jupiter, Sirius and the moon.
I used to have a Jaegers 6" f5 and it was wonderful for deep sky observing and comets.
There was a famous amateur astronomer by the name of Leslie Peltier. He wrote a wonderful book called Starlight Nights. He was a dedicated observer of variable stars and discovered many comets. His primary instrument was a 6" f8 refractor.
