J Costantini Posted May 20, 2005 Share Posted May 20, 2005 Hi. I would like to know more about 3-PERF. Do you have any websites to recommend? Or can you post a simple explanation. I have an idea of what it is, but would like to hear more about what´s possible and what is not possible with 3 perf. What may change during the processes (photochemical and electronic). Have you shot with 3-perf cameras? I know there are cameras like these here (in Brazil) but very few information about the advantages and risks (if any). Thanks. Link to comment Share on other sites More sharing options...
Premium Member David Mullen ASC Posted May 20, 2005 Premium Member Share Posted May 20, 2005 The standard 35mm camera and projection formats are 4-perf (four perforations tall.) In Full Aperture (the largest area possible using the whole film) a 4-perf frame is 1.33 : 1 (4x3). This dates back to the silent era. Since most modern filmmaking is widescreen, in many 4-perf 35mm formats, the whole 4-perf vertical area is wasted by cropping to widescreen. For example, the 1.85 projection format crops the 4-perf frame by more than 25%. In fact, the only projection format currently used that needs the whole 4-perf area is anamorphic (CinemaScope). Reducing the camera pulldown by one perf to only 3-perfs tall creates a full aperture negative that is about 1.78 : 1 (16x9). And it saves you 25% on film stock, with no quality loss if the end goal is cropping to 1.85 or 2.39 (compared to cropping 4-perf to 2.39, since a 2.39 frame only uses about 2 1/2 perfs out of four). And 3-perf is ideally suited for transfer to 16x9 video without any waste. Downsides are also many since 3-perf is not as common as 4-perf and no theatrical projection is 3-perf (and very little lab projection), meaning that if a print is required, it has to be optically or digitally copied over to a 4-perf 35mm projection format (i.e. standard 1.85 or 2.39 anamorphic.) Some links: http://www.arri.com/news/nab/3-perf.htm http://www.arri.com/news/newsletter/articl...10/filmfest.htm http://www.cinematography.net/Pages%20GB/3_perf_2.htm http://www.postproductionsolutions.com/html/3-perf_35mm.html http://psychcentral.com/psypsych/3-perf Link to comment Share on other sites More sharing options...
J Costantini Posted June 2, 2005 Author Share Posted June 2, 2005 thanks once again, david Link to comment Share on other sites More sharing options...
Nguyen D. Nguyen Posted June 10, 2005 Share Posted June 10, 2005 The standard 35mm camera and projection formats are 4-perf (four perforations tall.) In Full Aperture (the largest area possible using the whole film) a 4-perf frame is 1.33 : 1 (4x3). This dates back to the silent era. Since most modern filmmaking is widescreen, in many 4-perf 35mm formats, the whole 4-perf vertical area is wasted by cropping to widescreen. For example, the 1.85 projection format crops the 4-perf frame by more than 25%. In fact, the only projection format currently used that needs the whole 4-perf area is anamorphic (CinemaScope). Reducing the camera pulldown by one perf to only 3-perfs tall creates a full aperture negative that is about 1.78 : 1 (16x9). And it saves you 25% on film stock, with no quality loss if the end goal is cropping to 1.85 or 2.39 (compared to cropping 4-perf to 2.39, since a 2.39 frame only uses about 2 1/2 perfs out of four). And 3-perf is ideally suited for transfer to 16x9 video without any waste. Downsides are also many since 3-perf is not as common as 4-perf and no theatrical projection is 3-perf (and very little lab projection), meaning that if a print is required, it has to be optically or digitally copied over to a 4-perf 35mm projection format (i.e. standard 1.85 or 2.39 anamorphic.) Some links: http://www.arri.com/news/nab/3-perf.htm http://www.arri.com/news/newsletter/articl...10/filmfest.htm http://www.cinematography.net/Pages%20GB/3_perf_2.htm http://www.postproductionsolutions.com/html/3-perf_35mm.html http://psychcentral.com/psypsych/3-perf <{POST_SNAPBACK}> David, I just had a quick question. With 3-perf, I heard there was a problem with editing it on a flat bed since it doesn't calculate into the "number of frames per foot" value so well as the 4 perf 16 frames per foot. Is there some standard way around this? Link to comment Share on other sites More sharing options...
Dominic Case Posted June 11, 2005 Share Posted June 11, 2005 With 3-perf, I heard there was a problem with editing it on a flat bed since it doesn't calculate into the "number of frames per foot" value so well as the 4 perf 16 frames per foot. Is there some standard way around this? Not really. None of the manufacturers of flatebed editors have expressed any interest in making a 3-perf mod. You can change the sprockets on a projector to run 3 perfs at a time instead of 4, but it's not so simple with a flatbed as they use a multifacted prism which is the right size for 4-perf. If there was no such thing as non-linear editing then someone would have made a modification by now - but really 3-perf has gained a new life BECAUSE you can get the images off the film into a computer for editing, leaving the non-standard perforation count behind. 3-perf is good for TV finish work, and good if you are going through a DI, but the problems of editing 3-perf workprint, and the problems of neg-matching (because of the fact that keykodes occur every foot, or 21 1/3 frames instead of a round number, make it unattractive for a traditional finish. Link to comment Share on other sites More sharing options...
Premium Member Phil Rhodes Posted June 11, 2005 Premium Member Share Posted June 11, 2005 Hi, To be honest with you, it's enough fun for DI... Phil Link to comment Share on other sites More sharing options...
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