Nikon D40, Nikkor AFS 70-200mm VR with 1.4x TC
Would you believe that this is my first and only attempt at taking the Swiftlet?
Prior to this, I had actually stood for half an hour observing 2 of these swiftlets and noticed that they would fly a similar path repeatedly. I further tried to follow their movement with my camera whenever they make the pass for another 15min before I ventured to take this shot.
Guess it’s a mix of luck and practice.