Electronic First Curtain Shutter - Here's a good resource: Kasson Z6/7 Gotchas and fixesEFCS? this is my first telephoto
It doesn't have anything to do with telephotos per se just general practice with mirrorless cameras.
Which 70-200 is that?
We'll get this figured out . . .
And honestly, birds are difficult subjects. They flit; they move; they jerk around; and the slightest wind can smear detail. Small birds are actually the hardest . . .