b&w Kodak Film

One cartridge of Super 8 is 50' or 3 minutes and 20 seconds at 18fps.

What kind of camera were you using to get 10 minute rolls?

Hi,
I've never used B&W Kodak film before. I went to the camera store and they told me the rolls are only 3 minutes long! I know the color film i've used in the past is 10 minutes long. Is what she says true?
Please drop me an e-mail if you know. I don't visit this board often.
thanks