I don't know enough about the arri lenses and arriflex Cameras used on the Phantom Menace but Star Wars in 1977 was shot on the 8-perf VistaVision system. This was mostly the composite opticals and some live action plates. The rest of the film was shot on 4 perf Panavision i believe. only on Return of the Jedi during the original trilogy was the Panavision system not used. Lucas wanted to buy 2 cameras but they would only let them rent them so they used a different camera on Jedi.

I had always thought that was a 2:35:1 Anamorphic image. Obviously the negative area may be bigger than what is chosen to be actually shown as desired by the cinematographer. Negative width and Chosen aspect ratio are 2 seperate things.

Yes i know some modern films are like 2:40:1 or wider. And there are some Early examples of a wider selected aspect. Usually it was for films that were to be shown in the 70mm format.

The only info i can find on the cameras used on episode 1 is here

http://www.theasc.com/magazine/starwars/index.html

It is under camera lenses on the Episode 1 section.