For those who are interested. Inside are comparative images of the old 35mm film Projector and Digital Projector, along with the mechanisms of each. : r/movies
Trailer core - Sprocket School
Split Reel 35mm, 1000ft / 300m, metal, blue WCT SUPER 8 FILM SHOP
Movie Film Reel, 35MM, The Wild East, 1800 FT : Electronics
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Platter Systems - Sprocket School
8mm Forum: DIY Transfer Film on Cores to Reels
35mm 7 Split Reel / Flange. Perfect for trailers and previews
Core vs. Reel — Film Handling Training - Information Studies Library & Media Preservation Lab
35mm movie reel products for sale
35MM MOVIE FILM SPLIT REEL - NEW WITH TRAILER CORE