Phantom of the Opera (1925) Never in 3D

[Joe D.]

The two parallel cameras were most likely not for 3D.

It was common practice during the silent era to have two cameras shooting at the same time, the camermen standing next to each other. There would then be two negatives of the same picture to work with. One would be used for U.S. print. The other would be for the foreign print and the multiple copies with different language intertitles. If you ever come across a foreign version, one will notice scenes at a slightly different angle compared to the U.S. counterpart.

That was more likely the intent for the parallel cameras.