Re: [Frameworks] 16mm Double perf clear leader
Hey Scott, I just couldn't let 3% sit there as a description of the difference, because we are often measuring shrinkage on archival materials and know that anything over 1.5% is dicey running on sprocketed equipment. I think the proper math is: long perf - short perf / ((long perf + short perf)/2) * 100 long perf: 0.3" short perf: 0.2994" 0.3 - 0.2994 / (0.3 + 0.2994)/2 * 100 = 0.2% So I think the correct difference is 0.2%. -Sincerely, ---Buck Bito Lawrence "Buck" Bito Movette Film Transfer 1407 Valencia St. San Francisco, CA 94110 (Valencia at 25th St.) 415-558-8815 Open Tuesday - Saturday Tue+Thu: 8-6, Wed+Fri: 9-6, Sat: 10-4 www.movettefilm.com On Tue, May 3, 2016 4:55 am, Scott Dorsey wrote: > The film looks the same to the naked eye, it's just the distance between > the perforations differs by 3%. > > It's not like 35mm where the perforation shape is different between the > camera and print stocks. > --scott > ___ > FrameWorks mailing list > FrameWorks@jonasmekasfilms.com > https://mailman-mail5.webfaction.com/listinfo/frameworks > > ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
Re: [Frameworks] 16mm Double perf clear leader
Aha! http://www.wsmr.army.mil/RCCsite/Documents/451-00_Photography,%20Motion%20Picture%20Film%20Cores%20and%20Spools,%20Perforations%20and%20Other%20Technical%20Information/451-00.pdf Go to page D-4... this is the print stock. The camera stock standard is the same except that dimension B is 0.2994 inch instead of 0.3000 inch. --scott ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
Re: [Frameworks] 16mm Double perf clear leader
The film looks the same to the naked eye, it's just the distance between the perforations differs by 3%. It's not like 35mm where the perforation shape is different between the camera and print stocks. --scott ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
Re: [Frameworks] 16mm Double perf clear leader
The difference is the distance between the perforations along the length of the film. Here is the Kodak specification for 16 mm. I believe the original question was related to what kind of leader to use when coating you own film. 2R-2994—16 mm film perforated two edges with a perforation pitch of 0.2994 in. (7.605 mm), short pitch, ANSI / SMPTE 109-2003 2R-3000—16 mm film perforated two edges with a perforation pitch of 0.3000 in. (7.620 mm), long pitch, ANSI / SMPTE 109-2003 The short pitch is camera pitch and the long pitch is printer pitch. Printer pitch is longer because when the print stock is wrapped over the camera film on a contact printer it has a larger diameter. Bottom line: If you are coating leader with emulsion to shoot in a camera use short pitch. if you are making your own print stock use long pitch. For more details: http://motion.kodak.com/KodakGCG/uploadedfiles/motion/US_plugins_acrobat_en_motion_newsletters_filmEss_11_Film_Specs.pdf Sherman George On May 2, 2016, at 6:13 PM, Morgan Hoyle-Combs mailto:mhoyleco...@yahoo.com>> wrote: Scott, do you think I could see pictures of the two? It would help me understand the difference much better. From: Scott Dorsey mailto:klu...@panix.com>>; To: mailto:frameworks@jonasmekasfilms.com>>; Subject: Re: [Frameworks] 16mm Double perf clear leader Sent: Mon, May 2, 2016 12:21:30 PM It is a thing you should be concerned about if you ever intend on making a print. Use the same clear leader that you'd use for editing camera originals, not the leader you'd use for editing prints. That way you get the same pitch that camera originals normally have. That said... it is likely not difficult to modify a camera for B-wind instead of double-perf. If it's using those 50 foot magazines, there is a way to load B-wind film into them that mostly works. --scott ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com<mailto:FrameWorks@jonasmekasfilms.com> https://mailman-mail5.webfaction.com/listinfo/frameworks ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
Re: [Frameworks] 16mm Double perf clear leader
It is a thing you should be concerned about if you ever intend on making a print. Use the same clear leader that you'd use for editing camera originals, not the leader you'd use for editing prints. That way you get the same pitch that camera originals normally have. That said... it is likely not difficult to modify a camera for B-wind instead of double-perf. If it's using those 50 foot magazines, there is a way to load B-wind film into them that mostly works. --scott ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
Re: [Frameworks] 16mm Double perf clear leader
> What do you mean by long or short perf? Peforation pitch. The space between perfs is slightly wider on camera stock than on print stock, so they can be wound one on top of the other on a big sprocket and held in place without slipping for contact printing. So the leader and splicer you use are different (although a lot of splicers can be set up either way by the tech). --scott ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
Re: [Frameworks] 16mm Double perf clear leader
You want long or short perf? For camera originals, I'd try Christie's Editorial Supply or the guys at http://www.cutfilm.com. For prints, I'd try Urbanski or Spectra. --scott ___ FrameWorks mailing list FrameWorks@jonasmekasfilms.com https://mailman-mail5.webfaction.com/listinfo/frameworks
