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| | Mid-roll Film Change in Canon EOS Cameras |
 | | This way you can use films of different type (slide, negative, fl and white) or speed (100, 400, 800) exactly at the time you need them, without having to think too long in advance about what to load in the camera. |
 | | If you rewind the film in the middle of a roll, and later re-load it, it will be positioned precisely in the same way as before, and the frames will overlap exactly. |
 | | If that film had been also unloaded mid-roll, memorize the number of frames shot on this roll (you wrote it down on the cartridge last time). |
| www.chem.helsinki.fi /~toomas/photo/midroll.html (865 words) |
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