Donald.... It is probably my 'lack of reasoning' that is confusing you, sorry! Basically I was thinking for a triptych I would like to place three sheets of film in the holder and use different approaches on each sheet. Someone on the other forum has since suggested that I use various dark slide masks to achieve that effect.... That approach may bring me closer to what I want to achieve.... However.. I still need a way to place various films in the holder if I am using a combination of colour and b&w.