Full frame, no crop. Adding more than one TC denigrates the image too much, with slow/low quality lenses like this 500/7.2 just better off using it with only 1TC or alone and cropping.
Sony ILCA-99M2,Sigma 500/7.2, + 2xTC + 1.7xTC 1/200s f/34.0 at 1700.0mm iso800
full exif