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Author Topic: Strange Damage to Sleepy Hollow Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 12-18-1999 04:31 PM                     The Bringing out the Dead trailers were also printed with the silver retention John spoke of above. What size xenon lamp are you using and what make/model lamphouse? Any form of heat filter?  |  IP: Logged System Notices Forum Watchdog / Soup Nazi Posts: 215 Registered: Apr 2004 posted 07-23-2007 10:27 AM                 It has been 2773 days since the last post.  |  IP: Logged Donna Sylvester Film Handler Posts: 33 From: Burney, CA, USA Registered: Jan 2001 posted 07-23-2007 10:27 AM                        Does anyone know if they used the same process for some of the darker scenes in Harry Potter and the Order of the Phoenix?  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 07-23-2007 02:01 PM                     Not sure, but I have 4 prints locally running on 6K lamps without any hint of blistering. If you are seeing white specs/bubbles you need to verify you don't have your lamp focused down too tightly in the middle of the frame creating a hot spot. Ideally though you need to get a heat filter and also check to see if your projector is water cooled. If it is, your water circulator pump may have died or the tank is low. What make and size of lamphouse? Also what projector?  |  IP: Logged Donna Sylvester Film Handler Posts: 33 From: Burney, CA, USA Registered: Jan 2001 posted 07-23-2007 02:48 PM                        Lamphouse is a Xetron, 2000w. Projector is a Century S.A. The spots are all over the screen, not centralized in any one location. The fan is not water cooled.  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 07-23-2007 02:57 PM                     If you run the projector and lamp without film in the projector, are the corners of the screen dark, or is the light reasonably uniform? If you do have dark corners, back off on the bulb's focus controls so that you have even light. Being a 2000 watt lamp, that is probably all that it is. Let us know if you did not have have dark corners and we can continue troubleshooting.  |  IP: Logged Donna Sylvester Film Handler Posts: 33 From: Burney, CA, USA Registered: Jan 2001 posted 07-24-2007 12:28 AM                        The light output was pretty uniform--no dark corners. I backed the bulb off a little anyway. The last time this happened was with my Sleepy Hollow print.  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 07-24-2007 08:39 AM                     If this is an older xetron you may have a hot reflector and probably should put a heat filter in the nose cone the older xetrons like all hot mirror lamphouses were bad at blistering film  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 07-25-2007 06:48 PM                     If you have multiple spots either the reflector is bad or the lamphouse is grossly mis-aligned. Use of something like the Kinoton lamphouse alignment jig is a good place to start. Then touch up and finalize with the USL Light meter. If you do have the old type mirror or one thats damaged you shouldn't waste your $$ on a heat filter, they're about 1/2 the cost of the conversion made by Big Sky. Convert and get three times more light on your screen. You also get rid of the dang spider at the front of the reflector... that spider eats up some light and is NLA should it fall apart... Mark  |  IP: Logged

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