Quite beautiful. I was always curious about something, I heard that while TOS was shot with 50 ISO, it was later shot with 100 ISO. I always guessed it was the third season that did the latter, because it stuck me during a viewing of "The Enterprise Incident" that the shadows didn't quite look as strong as earlier episodes. I've never had this confirmed, because I can't seem to find any reliable info about it. Would you know anything?
An example: Kirk and Sulu, one from "Balance of Terorr" and then the second from "The Enterprise Incident".