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Author Topic: How can it be out of focus only on one side of the screen? Rick Long Jedi Master Film Handler Posts: 759 From: Toronto, Ontario, Canada Registered: Nov 1999 posted 01-07-2003 03:58 AM                     Maybe just cleaning the finger-prints off the lens?  |  IP: Logged John Pytlak Film God Posts: 9987 From: Rochester, NY 14650-1922 Registered: Jan 2000 posted 01-07-2003 07:19 AM                        Usually dirt, fingerprints, or haze on optics (lens or port glass) produces contrast-reducing flare, but a severe fall-off in resolution on one side would not be a typical symptom.  |  IP: Logged David Stambaugh Film God Posts: 4021 From: Eugene, Oregon Registered: Jan 2002 posted 01-07-2003 11:20 AM                        I remember seeing "The Player" with this problem. The image was focused on the left and right, but obviously very soft in the center. I complained, but they were not able to fix it.  |  IP: Logged Pat Moore Master Film Handler Posts: 363 Registered: Mar 2000 posted 01-07-2003 08:06 PM                     So Tim, what did you find out? Pat  |  IP: Logged Nathan Guerriero Film Handler Posts: 43 From: Chicago, IL, USA Registered: Apr 2002 posted 01-07-2003 08:23 PM                     I had this very problem on one of my screens with a century JJ. The culprit turned out to be a gate straps that would not stay aligned due to a bent film gate. It was easily, though not cheaply, remedied. I am still, symied, however, on one final question: WHO BENT THE FILM GATE???  |  IP: Logged Tim Turner Film Handler Posts: 87 From: Chula Vista, CA, USA Registered: Jan 2002 posted 01-07-2003 09:31 PM                     quote: Originally posted by Pat Moore.So Tim, what did you find out? Pat Well I'm still taking in all this information. You are guys are wonderful! I will pass all this along to the head projectionist. Is there a diagram around of a film gate that lists all the parts and pecies I need to look for? This is a Simplex TU-2000 with a manual lense turret. Also is it possible for the heat from the lamp to damage the lense. If the changeover is open? I've seen this happen before and I know how hot that lamp can get.  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 01-07-2003 09:40 PM                        It is VERY possible for heat from the lamp to damage the lens, but I don't imagine it would damage it in that fashion. I could be wrong. Heat damage from the lamp usually results in a very hazy low-contrast screen image.  |  IP: Logged Daniel Boisson Expert Film Handler Posts: 157 From: Buffalo, NY, USA Registered: Oct 2001 posted 01-07-2003 11:01 PM                     we have this problem with one of our screens, our tech said the lens *might* have been fried at one point in the past, damaging the anamorph, although this particular lens is a very cheap one...  |  IP: Logged Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 01-08-2003 01:50 AM                     That manual turreted head is a bit on the ruff side at best and from what i was told had a checkered history. Most likely culprit are the gate rails and the lens. The rails were worn when I was there in the spring. The lens wouldn't like the eposure to white light from an open dowser especially since the bigger lamp was installed then. When I put the larger lamp in I did realign the lamphouse and the light on the screen was about 85% side to side so a hot spot should not be an isue unless it has been adjusted since then  |  IP: Logged Randy Stankey Film God Posts: 6539 From: Erie, Pennsylvania Registered: Jun 99 posted 01-08-2003 10:31 AM                     While the film is running, put your hand on the lens turret, as if you were going to open it. Gently try to push the turret open and shut. (Wiggle it.) If you find play, the turret will be out of alignment, thus moving the lense(s) off center with the film plane. The lens(es) MUST be perfectly perpendicular with the film plane or you will get a partial "out of focus" position as you describe. The solution is simple. Have your technician or head projectionist realign and tighten the screw(s) that hold the turret shut. This is literally a screwdriver-type job. It can take just a minute or two to complete... But it MUST be done properly or else you might mess up more things than you fix. When I have had reports of this problem in the past, this is the first thing I would ask... "Does the turret move?" If it did, I had a 90% chance that this was the problem. Of course, there are many other things that can cause this but this is one of the simplest and easiest to fix. Always check the simple stuff first.  |  IP: Logged Tim Turner Film Handler Posts: 87 From: Chula Vista, CA, USA Registered: Jan 2002 posted 01-13-2003 11:44 AM                     Ok just an update here. The problem seems to have been found, but we are unable to test it out due to fear of Electrocusion So I'll ask you guys if this could be the cause of the blurred left side of the screen. Yesterday, the lamphouse would not power up, and when we opened it we found that that thin sheet of metal that gets blown by the exhaust fan had become stuck in one position. Wiggling that got the lamp to strike. But We also noticed that the Binding Post and Positive Lead Ass'y, where that ground wire of the Xenon lamp plugs into was severly burne. Infact there was a big hole burned right in the middle of it, and the ground wire was slowly sinking right through it. The burning looks like it had been happening over a period of time. Any dust and ashes from the binding post (Is is called a Gadsket ?) where all over the place, including the Mirror, and we think that is whats might be causing the the blurred image. But we are unsure because we've learned that the insenertated binding post is a major problem and if the ground sinks too far down and touches a metal part of the projector, the projectionist might fry operating the projector! Could this be the cause of the blurry screen? And what the heck could have caused the burning of the Binding Post and Positive Lead Ass'y?  |  IP: Logged Paul G. Thompson The Weenie Man Posts: 4718 From: Mount Vernon WA USA Registered: Nov 2000 posted 01-13-2003 01:12 PM                     Possibly. It sounds like the bulb may have been far enough out of alignment causing the film to buckle in one side of the film trap. Chances are, you had one heck-of-a-hot-spot on the screen. What I mean by that is the illumination of the screen from side to side and top to bottom was not even.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 01-13-2003 02:04 PM                     Tim, Best idea is to replace all those burned up parts, do a proper bulb alignment, and see how it looks then. If ya don't get the parts replaced you may well be completely off the screen soon! Mark @ CLACO  |  IP: Logged Ken McFall Jedi Master Film Handler Posts: 615 From: Haringey, London. Registered: Apr 2001 posted 01-13-2003 08:59 PM                     Paul... Cineshitty..... what make is that, never heard of it, is it american by any chance. Got any pics to share?  |  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 01-13-2003 09:00 PM                        Ken, I believe Paul was referring to the Italian Shakeameccanica.  |  IP: Logged

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