This is topic Exact 35mm frame size. in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.
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Posted by German Marin (Member # 918) on 01-13-2002, 05:54 PM:
In a 35mm film, What's the distance between each four perforation? I'm working as a projectionist for almost 1 year and I've been thinking it's about 18mm or 19mm. (Is hard to measure it!)
Posted by John Pytlak (Member # 331) on 01-13-2002, 07:08 PM:
For 35mm print film, the "pitch" or distance between each perforation is nominally 0.1870 inches. So the pulldown for each 4-perf frame is 0.7480 inches (19.00 millimetres).Standard SMPTE 195 specifies the projectable area for 1.85:1 "flat" as 0.825 x 0.446 inches. For 2.39:1 "scope", the projectable area is 0.825 x 0.690 inches.
You can obtain copies of the SMPTE standards from the SMPTE at:
http://www.smpte.org/smpte_store/standards/
------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
Posted by German Marin (Member # 918) on 01-13-2002, 08:22 PM:
Thanks John, I was talking to my workmate about the speed of the film from platter to projector. Now I know the speed of film is 1,641.6 meters per hour (Maybe a new variable in our film lexic: Flm=1,641.6 m/h) 