 |
|
 Home
Products
Store
Forum
Warehouse
Contact Us
|
|
|
|
 
|
|
Author
|
Topic: Wow! An article in SMPTE about FILM!
|
John Walsh
Film God
Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999
|
posted 11-03-2001 03:17 PM
There's an article in SMPTE about getting more light on screen by a special-design quick pull down intermittent ("Quickermittent"). The "Quickermittent" can increase light about 36%. This seems pretty good, and worth it if the cost is only a little higher. I'd be worried about maintaince, though.Does anyone know (to compare): Did those drive-in quick pull down intermittents last as long as a regular intermittent? There's also a special lamphouse to increase light with a "waffle" or "fly's eye" lens design, with a Cermax integrated lamp package (the lamp has a smaller arc gap, but brighter arc.) The prototype was said to put 16fL on screen with 1500 watts (30 ft wide 'scope screen; 114ft throw.) While this is certainly more efficient than what you would get using the old rule of thumb (height of the screen, squared X 12, which for this example states you need a 2000w lamp) it does not seem enough of an improvement to pay extra for; ie the same money spent for the next size lamp would provide the required light. Plus, you'd be locked in to one particular type of lamp (though not necessarily manufacturer), which is not a standard type used in most of the industry.
| IP: Logged
|
|
|
|
|
|
John Pytlak
Film God
Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000
|
posted 11-05-2001 02:28 PM
The Kodak technical paper "Design Improvements for Motion Picture Film Projectors" is in the November 2001 SMPTE Journal, Volume 110, Number 11, pp.785-791.Here are links to the Kodak patents, developed to "Enhance the Theatrical Experience":
Kodak Lamp Patent
Kodak Intermittent Patent Increased efficiency is only one of the many advantages of the Kodak lamphouse design. Illumination uniformity is greatly improved, and the modularity simplifies field alignment. The faster pulldown of the Kodak intermittent design greatly improves light efficiency, which can put more light on the screen, or allow the use of a three-blade shutter to reduce flicker.
------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: 716-477-5325 Cell: 716-781-4036 Fax: 716-722-7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion
| IP: Logged
|
|
Mark Gulbrandsen
Resident Trollmaster
Posts: 16657
From: Music City
Registered: Jun 99
|
posted 11-05-2001 05:33 PM
David said..."They are also much more expensive to rebuild if there is a problem." The high speed X-L movements are great, especially with the advent of estar stock. Using synthetics with addatives will make them last far longer and give you some chance of surviving a short dry run. Rebuilding these is no longer possible as parts were discontinued many years ago. If ya know someone with NOS parts you're fine. Otherwise ya better keep a spare movement around. The higher speed pull down of the Quickermittent will most likely also spell Quickerwearout.....
Mark @ GTS
| IP: Logged
|
|
|
|
All times are Central (GMT -6:00)
|
|
Powered by Infopop Corporation
UBB.classicTM
6.3.1.2
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.
|
|
|
|
Printer-friendly view of this topic