Found this thread today, figured I could add some info for you. Not sure where you are with your tests, but a problem with the 100D and the 814 AutoZoom is that the cartridge is notched in such a way (actually, not notched, to be accurate) that the built in 85b filter is kicked into place, which you don't want, and you cannot disengage it without breaking the switch (which actually won't disengage the filter, you'll just break the switch). All super-8 cameras have a built-in 85b filter, because it used to be the case that all the color film for super-8 was tungsten balanced, but since Kodak has eliminated their tungsten balanced reversal stock, the 100D poses some tricky problems to deal with, namely that, in daylight, you need to shoot with the camera set in the tungsten position. When you shoot in the daylight position, there's an orange filter in place. Not all camera models have this problem, but the 814 AutoZoom does. (the 814 xl-s does not.) To solve it, you need to cut a notch in the cartridge to prevent the filter from being kicked in. With the camera on its side (light meter battery compartment cover side down) and the film compartment open, there is a small peg in the upper right hand corner of the film compartment, which gets pushed in when you insert the cartridge and kicks that filter into place. You can cut a notch in the film cartridge to allow that peg to stay in the "out" position, which will allow you to shoot that daylight balanced film outside while keeping the camera filter in the tungsten position. You could use a dremel tool.
