Peter knew how complicated Sirius could be, but this wasn't the discussion to have with her while visiting the Muggle world, or possibly ever. It was Sirius' story to tell. Instead he concentrated on the journals and the difference between the Muggle world and the magical one.
"Oh definitely. Not sure how much time there will be with all that we have to do, but it'll be a nice side project." Together with the map and other things. Their side projects were becoming a full time job too. "Do you think they still exist? Maybe in the vault?" Where would they find magical cameras? "I never figured out if it was the cameras that were different, or if the filming process was different, but you needed old fashioned cameras because the magic would interfere with the batteries." He looked around at the many people with electronics. "Do we think we can even find cameras with no batteries? Merlin, I really feel out of time right now."
Still the feeling made him more determined. "We need to go in search of cameras with no batteries and then we need to find a way to develop the pictures. I'm guessing you need a dark room, but also a developing liquid. Do you have any idea how to do that? Because pictures sound brilliant."
He knew that this was just a stepping stone. "It can't be what keeps us together, though, because what happens when we find the vault? We all take what we want and goodbye? The only thing that will keep us together is making sure people start to rely on each other and start to care for each other. If you don't think you're wanted, then you fuck off like Glenda did."