15/05/2020
Photos courtesy by Y. Lin from Singapore.
Lens: Sigma Contemporary 150-600mm F5-6.3 DG OS HSM (Canon EF Mount)
Converter: Sigma TC-2001 2x
Thank you, Mr. Lin, for sharing the photos.
The converter really works well and birds look so close and real. The very first photo down below can tell you the actual distance.
Some info from Mr. Lin:
The dark bird is a Oriental Dollarbird, the bright birds are Rose-ringed Parakeet, and the "eagle" is a Brahminy Kite.