Aperture plates: Difference between revisions

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Aperture plates are used to mask the image in the gate. Projectors use either single aperture plates or multi-format "sliding" aperture plates (commonly found in turret projectors). Plates are cut for each aspect ratio a booth might show, and are cut for each projector and screen, using test films to get each aspect ratio as close to SMPTE specifications as the lenses and [[masking]] will allow.   
Aperture plates are used to mask the image in the gate. Projectors use either single aperture plates or multi-format "sliding" aperture plates (commonly found in turret projectors). Plates are cut for each aspect ratio a booth might show, and are cut for each projector and screen, using test films to get each aspect ratio as close to SMPTE specifications as the lenses and [[masking]] will allow.   


[[File:Kinoton and Ballantyne Aperture Plates.jpg|right|thumb|300px]]
[[File:Kinoton and Ballantyne Aperture Plates.jpg|right|thumb|300px|Kinoton and Ballantyne aperture plates: identical except for the plastic handle.]]


Each projector manufacturer (Century, Simplex, Kinoton) has different aperture plates, and most vary model to model. Most are not interchangeable, with the exception of Ballantyne Pro 35 and most Kinoton/Norelco/Phillips models.  
Each projector manufacturer (Century, Simplex, Kinoton) has different aperture plates, and most vary model to model. Most are not interchangeable, with the exception of Ballantyne Pro 35 and most Kinoton/Norelco/Phillips models.  
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'''Cutting Aperture Plates:''' Aperture plates are typically cut using flat files that are blank on two sides. Ideally the technician or projectionist will begin with a plate that is "pre-cut" for their aspect ratio, but in some cases will have to use what is available, for example cutting a 1.66 plate out of a 1.85 plate. '''IMPORTANT:''' Projectors must be cleaned thoroughly after plates are cut. Stray bits metal can work their way into the film path and scratch the film.
'''Cutting Aperture Plates:''' Aperture plates are typically cut using flat files that are blank on two sides. Ideally the technician or projectionist will begin with a plate that is "pre-cut" for their aspect ratio, but in some cases will have to use what is available, for example cutting a 1.66 plate out of a 1.85 plate. '''IMPORTANT:''' Projectors must be cleaned thoroughly after plates are cut. Stray bits metal can work their way into the film path and scratch the film.


[[File:Apertureplates.JPG|thumb|300px|Aperture plates from a [[Kinoton]] E-series 35mm projector (top), a [[Century]] 35mm projector, and a [[Simplex XL]] 35mm projector]].
[[File:Apertureplates.JPG|thumb|300px|Aperture plates from a [[Kinoton]] 35mm projector (top), a [[Century C]] 35mm projector, and a [[Simplex XL]] 35mm projector]].
[[File:Apertureplate-norelco.jpg|thumb|300px|Aperture plate from a [[Norelco AAII]]]]
[[File:Apertureplate-norelco.jpg|thumb|300px|Aperture plate from a [[Norelco AAII]]]]


[[Category:Equipment]]
[[Category:Equipment]]
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