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

» Film-Tech Forum ARCHIVE   » Operations   » Film Handlers' Forum   » Possible contrast killer question.

Author Topic: Possible contrast killer question. Alan Gouger Jedi Master Film Handler Posts: 501 From: Bradenton, FL, USA Registered: Jul 2000 posted 03-27-2007 06:42 PM                        Something I have always wondered. Most projection booths keep some lights on. Even though the theater is dark part of the projection path from lens to screen starts out in the booth for about a foot or so before entering the dark theater. Does booth lighting hitting that foot or so of exposed projection beam cause any loss in contrast.  |  IP: Logged Monte L Fullmer Film God Posts: 8367 From: Nampa, Idaho, USA Registered: Nov 2004 posted 03-27-2007 07:04 PM                     quote: Alan Gouger Does booth lighting hitting that foot or so of exposed projection beam cause any loss in contrast. ..something not to get all worried about since this weak outside light isn't within the same travel of the projected beam, which is tons brighter.  |  IP: Logged Cameron Glendinning Jedi Master Film Handler Posts: 845 From: West Ryde, Sydney, NSW Australia Registered: Dec 2005 posted 03-27-2007 08:44 PM                     Not regularly cleaning ports and dusty lenses are the real contrast killers.  |  IP: Logged Kyle Anderson Film Handler Posts: 86 From: Tyler, TX, USA Registered: Dec 2005 posted 03-27-2007 08:46 PM                     The light interference from the two angles/beams does not exist once you leave that volume of beam intersection - so the screen will not be affected, unless the ceiling light is shining directly on the screen (not likely).  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 03-28-2007 08:53 AM                     Beams of light do not interact. Contrast can be affected by lots of things, but you could intersect the projection beam with spotlights, other projector light beams, any number of megawatt laser beams, whatever... and not affect the picture contrast (or any other picture quality)in any way if none of the intersecting light beams fall on the screen directly or through reflection.  |  IP: Logged Alan Gouger Jedi Master Film Handler Posts: 501 From: Bradenton, FL, USA Registered: Jul 2000 posted 03-28-2007 11:06 AM                        quote: Dave Macaulay Beams of light do not interact. Contrast can be affected by lots of things, but you could intersect the projection beam with spotlights, other projector light beams, any number of megawatt laser beams, whatever... and not affect the picture contrast (or any other picture quality)in any way if none of the intersecting light beams fall on the screen directly or through reflection. Thank you. Thats what I was looking for.  |  IP: Logged

All times are Central (GMT -6:00)

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.