How many movies have Mikael Åkerfeldt and Peter Lindgren acted in together?

They have worked on 4 movies together! Their first movie together was Opeth: Still Life (1999) while their highest rated movie together was Opeth: Lamentations (2003). They have not worked together since Opeth: The Making of 'Deliverance' & 'Damnation' (2015). They are most known for their music films together.