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| a mechanism through which film passes in a projector for conversion of the soundtrack into audio-frequency signals to be amplified and reproduced |
| a horizontal line separating consecutive frames on a strip of film |
| extension ring or extension tube | |
| —n | |
| photog a spacer element that can be fixed between the camera body and the lens to increase the distance between film and lens and allow closer focus than would be possible without it | |
| extension tube or extension tube | |
| —n | |