In both 8mm and Super 8, the width of the film is eight millimeters.

But the size of the Super 8 image-rectangle is bigger -- so big, in fact, that the sprocket hole intrudes.

You may find more information at the 8mm Film Metadirectory lavender.fortunecity.com/lavender/569/

Also Pro8mm www.pro8mm.com/ is a Hollywood lab which caters to 8mm filmmakers.

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8mm takes 16mm film and develops half of it in the camera. Then, the film is reversed, and the other half is developed. When the film is processed, the lab slices it in half, so voila! You have 8mm film. Good luck finding someone anywhere who can process 8mm film. However, if you shoot the film and then turn the camera upside down while filming the other half, you can just get it processed as 16mm, which will give you two different images on both sides of the screen. If I remember right, the 16mm projector will show 4 images at once--because 8mm is 1/4 the frame of 16, right?

Super-8 was developed later in the 60's for home movies, putting the film into a cartridge that pops into the camera. Easy. And one of the only ways to shoot Kodachrome anymore. There still are places that process this kind of film.

Ok, hope that helps.

-m