Something new I have noticed about The Sopranos upon rewatch...(Cinematography)

The entire look of the show changed around season 4. The cinematography is completely different in 4-6. It's darker and shadowy. It's is night and day compared to the brightly lit and more traditional cinematography of 1-3. Starting around Season 5 the show was shot more artsy as well. To me the show looks way better in the later seasons and very auteur-ish. I don't know if the intention was to make the look and feel more dark as the series itself got darker and more bleak, but man what a noticeable contrast.