crwdns2934241:0crwdne2934241:0 Mark Bowman

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You probably have some kind of substance on the camera rollers. The dots are caused by contamination making a  "bump" on one of the rollers which is pinching the film everytime the roller rotates - like a lentil stuck on a rolling pin. You'll need to clean the rollers, preferably with Isopropyl alcohol on a cotton bud.

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