Njaco
The Pop-Tart Whisperer
Good stuff. The last shot is a 'still' from cine film, which was later 'colourised' for inclusion in the 'World War 2 in Colour' series on British television. I have it on DVD, in original B&W and in the 'colourised' version.
The SPG really kicks back on its tracks when it fires, creating a lot of dust from muzzle blast, just seen forming in the photo.
The full video is also part of the early 1990s series "Tanks", specifically the 'Sturmgeschutz' episode.