Single 35mm Roll in Two Rolls Paterson - Full Cap. Developer or Half Cap. Developer

Our course instructor directed an attendee to half capacity - 300ml- use of developer in 2 rolls 600 ml capacity paterson for develop single roll. I did not like the idea to mix half full tank with lots of air inside. What do you say?

It's fine. The roll needs to be submerged, that's all, so ensure the reel is slid all the way to the end of the center column so the film sits at the bottom of the tank.

If you put that tank on a roller base so it sits horizontally and it rotates all the time, you could use even less. But you have to start taking into account the minimum amount of developer (concentrate) for a roll of film as stated by the manufacturer.

In short, your instructor is right.

The Patersons have instructions on the bottom.