I am about to complete my testing, then this topic can die and I will go back at shooting cars..
or maybe birds?
185mm the first, 235 the second. Both pretty sharp (both 1/640 anyway, so difficult to mess up
). For sure the constant focusing option is damn good for such task (first pic obviously).
Only car, this plain 993 C4, shot at 170mm, 1/250, F5, obviously no filter.
As expected, you can't use a not stabilized telelense in difficult light conditions with a filter
Anyway, I am getting the feel of it finally.. today I could go hunting some more