How many old shows get remastered to 16:9 anyway? It didn't happen with TOS for one <snip>
Live-action footage from TOS was cropped at the top and bottom, for some stations. The new SFX shots were composed in 16:9 and the reverse done, sides removed for 4:3 editions.
Some comparison screencaptures from "The Man Trap".
Remastered show on DVD versus CBS Action screenings.
















It's occasionally true, that there is no one true aspect ratio. Several episodes at the start of Enterprise's production, contain more picture detail in 4:3 and had to be cropped for widescreen, once it became clear that was the uniform way TV was going. So the Pilot, "Broken Bow" was done with both in mind and Sky here in Britain, continued showing Trek full-frame until the end of its second season. As the first season goes on (about half a dozen episodes in maybe) you can see more and more beginning to be specifically composed for 16:9... as the shots stop being as tight and closer to the actors.
Travis is reduced to just a head in the widescreen version!
Many shots show a preference for taking the 16:9 matte higher in the frame.
Some scenes, like this effects shot, are equally pleasing to the eye in either ratio.
Others would appear clearly composed for 16:9. Here the open matte 4:3 version has just empty space to the top and bottom of the frame. Note that the credits have been created separately for both versions.
Interestingly, other shots have a much more pleasing composition at 4:3 with the widescreen version cutting into the top of Soval's head.