There were, to my knowledge, three versions of the Mido film holders...the
first version held
one piece of sheet film, and the
second version was double-sided to
hold two films. So an important question to your request is "WHICH version do you have?" The Mido is somewhat finicky to use.
there are THREE VERSIONS!
- I have tried loading one type in the dark...forget it, even in the light! The salesman in the pro store couldn't either!
- Another version was easier to load in the dark, but required greater handling of the film (not desireable).
- The most recent version (in1999) is more like a conventional holder, but I have no experience with it at all, so no opinion.