my profile | my password | search | faq & rules | forum home

» Film-Tech Forum ARCHIVE   » Community   » Film-Yak   » Ebert Praises Maxivision 48 (Page 3)

This topic comprises 3 pages: 1  2  3

Author Topic: Ebert Praises Maxivision 48 John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 04-17-2003 02:47 PM                        Both 65mm cameras (30fps) and 35mm cameras (24fps) were used, sometimes shooting a scene simultaneously, other times as different takes. Here's the story: http://www.widescreenmuseum.com/widescreen/wingto1.htm http://www.widescreenmuseum.com/widescreen/wingto5.htm  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-19-2003 10:05 AM                     "Active Registration: What problem does this solution address?" _________________________________________________________________ Actually this is a neato idea and if its actually registering each frame then itsa great idea.....one could have precise frame registration without having to resort to expensive dye transfer prints. The RCA FR35 A&B projectors had an active registration circuit that looked at two perfs and nulled out the difference between the two using the pull down servo motor to do so just before the frame was projected. Although an early attempt at this it really worked, but only in the verticle sense, not laterally. Having some sort of registration marks printed on the film for a similar circuit to look at would work better. With the RCA system if there was any major perf wear it could actually cause the picture to become more unstable. If it was related to framing, which IMHO would be a waste of effort it might appease the DP's and director as they can be very fussy about prefect framing during projection. I'd sure like to know more about which they are talking about though..... Mark @ CLACO  |  IP: Logged Steve Kraus Film God Posts: 4094 From: Chicago, IL, USA Registered: May 2000 posted 04-19-2003 10:18 AM                    Any decent machine in good working order can produce a satisfactorily steady image. Most of the unsteadiness is from printing. So there's little point to investing in technology that's going to steady the image to the Nth degree unless you first do something about the prints.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-19-2003 10:55 AM                     Steve, You missed my point. The registration thing would in theory take at least a large chunk out of the unsteady prints that are being made today.......in other words let the projector do the job of registering each frame to a refrence mark printed perhaps on the frame line. The only other way to get absolute steadiness in a release print is to make dye transfer prints, or step printed release prints....but the latter is totally unfesable except for just a few prints for important locations. Mark  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 04-19-2003 04:06 PM                        Properly contact printing a short pitch original to a long pitch print stock should produce very steady images. Unsteadiness is often the result of using short pitch raw stock on a continuous contact printer -- there will ALWAYS be some slippage in this situation. A much slower pin-registered printer should always be used when printing onto short pitch film.  |  IP: Logged Christopher Seo Jedi Master Film Handler Posts: 530 From: Los Angeles, CA Registered: Jun 99 posted 04-20-2003 09:06 AM                     Mark, Where was that RCA projector used? Telecine?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-20-2003 10:55 AM                     Chris, Those were used at two locations in Chicago. The FR35A was at Astro Labs, and the FR35B was at Editel. I ultimately ended up with the FR35B at home when Editel pulled it to replace it with a new Bosch scanner. The FR35B was pretty much the same as the present day Westrex electronic projector. Film was rewound through the gate at high speed!! The circuitry allowed the intermittent servo motor to run its sprocket continously at high speed to do this. RCA also made a screening room version of the 35B that would mount to a standard pedestal, so there may well hvae been a few of them on dubbing stages. All of these machines could run at the special tv pull down rate, or regular 3-1 pull down. Counting the film take up servo system there were 5 servo motors in it. Intermittent, Feed sprocket, Shutter, and upper and lower reels. Mark  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 04-20-2003 01:43 PM                     Mark you forgot to mention that those servos sometimes had minds of there own  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 04-20-2003 09:57 PM                     The FR35A servos were definately doing things on their own terms....but that was all fixed in the FR35B. It was a reliable, rock steady machine. The ONLY problem with the B version was if one of the supply rail fuses in the reel servos ever blew. When that happened both of the reels went to hyperspeed instantly, and depending on if it was the positive or negative rail fuse that blew determined if film shot out all over the room or if the film got shredded to bits. Ay any rate it was possible to ahe about 1K feet of film all over the room in half a millisecond! Mark  |  IP: Logged Daryl C. W. O'Shea Film God Posts: 3977 From: Midland Ontario Canada (where Panavision & IMAX lenses come from) Registered: Jun 2002 posted 04-20-2003 10:38 PM                        1 millon feet per second... now that's an impressive shuttle speed!  |  IP: Logged

All times are Central (GMT -6:00)

This topic comprises 3 pages: 1  2  3

Printer-friendly view of this topic

Hop To: Select a Forum: Category: Operations -------------------- Digital Cinema Forum Film Handlers' Forum Large Format Forum Ground Level Feature Info, Trailer Attachments & REAL Credit Offsets Category: Community -------------------- Film-Yak Film Handlers' Movie Reviews The Afterlife Bob Maar's Joke-A-Thon Category: Classified -------------------- Equipment and Supplies Wanted/For Sale Help Wanted/Seeking Employment Category: System -------------------- Software Beta Testing Forum

The Film-Tech Forums are designed for various members related to the cinema industry to express their opinions, viewpoints and testimonials on various products, services and events based upon speculation, personal knowledge and factual information through use, therefore all views represented here allow no liability upon the publishers of this web site and the owners of said views assume no liability for any ill will resulting from these postings. The posts made here are for educational as well as entertainment purposes and as such anyone viewing this portion of the website must accept these views as statements of the author of that opinion and agrees to release the authors from any and all liability.