Hotswapping with Multiple ISO Films?


Question to all you techy film folks: If I have a variable ISO film, can I swap ISOs on the fly & still end up with all photos correctly exposed at the end? Say I have a 100/1000 ISO film, if I shoot two at 200, then one at 100, then the rest at 800, when it’s developed, will they all be okay, or will I get some under-exposed, some over-exposed, and some just right (due to them all being in the emulsion for the same amount of time)? It may be a silly question but I’d like to know before I go out & shoot!

To compound the issue further, I had some redscale where I intentionally over exposed one frame, and while the whole roll looked great. Compare this (normal daylight exposure in sun):

Credits: lokified

…to this (Put in bulb mode & held for 4 seconds):
Credits: lokified

What about you, smart people? Do you have answers for me?

written by lokified on 2012-11-16


  1. gauthierdumonde
    gauthierdumonde ·

    On the variable ISO films you have to choose one ISO setting and develop it at that setting. I love the the Fuji slide ISO 100/1000. They had them in the lomoshop and I ordered a bunch. I use them for high ISO's because it is currently the only slide film I know going up to ISO 1000. The film was never popular because for all ISO settings there were better films. But it is great for lomography. You have to shoot a test roll (over and underexpose at the setting you rated) when crossing this one because it behaves a bit different.

    About the Redscale: it is difficult to overexpose a redscale. If you expose correct you will get very red pictures. Over expose one or two stops and you get a lighter result, that's the one I like. Overexpose 4 or five stops and normal colors will start to appear. That's why I like redscale. You can load it into a Lomo Smena and start shooting without caring for exposure. :)

  2. lokified
    lokified ·

    @gauthierdumonde Thanks for being Knowledge Guy. I suppose Redscale has spoiled me in that regard. :D