Can you explain to me why it is, scientifically and in detail, that a ghost shows up on film?
Understanding the principles of how a camera functions and captures light and how the chemical process works on the film...

After doing so.... Can you, then, explain what it is that makes ghosts supposedly ALSO show up on pictures taken by digital cameras which work entirely differently from analog ones?!

See, people don't know any better. They hear that ghosts show up on film, it doesn't occur to them that digital cameras are different from analog and so they produce pictures taken with a digi-cam supposedly showing ghosts- the same as they would with an analog camera !
Hello... did ya miss the boat? That's like showing me a picture of sound or smell. You need the right equipment. Apparently this doesn't occur to the average believer layman, nor do they want it to occur to them. It completely undermines their claim.