Just a little presentation of the power of the Sigma 150-500mm with 1.4x kenko teleconverter.
(Update: Added better images, still no tripod, but lower ISO.)
@ 18mm
@500mm 350meters away (no teleconverter)
@700mm 350meters away
@500mm 285meters away (no teleconverter)
@700mm 285meters away
@700mm 285meters away with Tripod
