|Welcome to Sprocket School! This project is maintained by volunteer editors. A guide to editing.|
Test films are tools for calibrating, aligning, and checking film projectors and their components. Issues that can be diagnosed and corrected with the guidance of test films include ghosting, focus, framing, and pedestal adjustments. They are sometimes used in conjunction with test equipment.
The term generally refers to films made by technical bodies like SMPTE or by manufacturers like Schneider Optics specifically for test purposes, which are designed to help to calibrate your equipment so that it adheres to a certain set of image or audio standards.
In practice, term may also be used more casually to refer to any piece of footage used to test a projector, such as a fresh trailer used to conduct a scratch test.
Common types of test film
- SMPTE RP-40 - Visual focus test film for 35mm
- SMPTE RP-91 - Visual focus test film for 70mm
- SMPTE P35-BT - Buzz Track - Sound test film to set lateral position of film in the soundhead.
- Dolby CAT. NO. 69P - Pink Noise test film (contains all frequencies) used for focus and azimuth adjustment of the slit lens
- Dolby CAT. NO. 69T- Dolby Tone test film
- Dolby CAT. NO. 97 - Stereo cell alignment film used for measuring crosstalk between the left and right channel.
- Dolby CAT. NO. 151 - Surround test, used for a subjective comparison of the levels for the center and surround channels.
click to enlarge You may notice some of them are dirty, it's because they've been used many times! As they should be.
Sources of test film
- SMPTE Test Materials for Motion Picture and Television catalog (c.1985)
- SMPTE Test Film Program: 35-PA 35mm Projector Alignment Test Film & 35-IQ 35mm Image Quality Test Film (1996)
- RP31 35mm film installation by artist Lucy Raven involving various test films.