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Author Topic: Zenith ZX4000H too Dark Gordon McLeod Film God Posts: 9532 From: Toronto Ontario Canada Registered: Jun 99 posted 06-04-2007 08:18 PM                     Just a wild shot in the dark (no pun intended) there is a small heat plate of waffled metal behind the apperture I have seen a machine with an incorrect on fitted and that cut down the light dramaticaly Also measure the width of the shutter blade and compare it to another machine  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 06-04-2007 08:36 PM                        Is this a double shutter projector? If so, it is possible to have more blades closed than the amount you want. In fact, you could have complete darkness if completely unlucky. Louis  |  IP: Logged Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 06-05-2007 01:22 AM                     I will check on the width of the shutter blades and also on that small heat plate of waffled metal to see if it installed correctly. Demetris  |  IP: Logged Ken McFall Jedi Master Film Handler Posts: 615 From: Haringey, London. Registered: Apr 2001 posted 06-10-2007 09:58 AM                     Louis the vic 8 is not made with a double shutter. It uses a standard twin blade shutter. There are two versions of the shutter blade one with slightly larger blades but that would not cause the loss of light that is being suggested. There is one thing I did not see mentioned and that is the lamp adaptor that is fixed to the negative end of the lamp. These are needed to allow different sizeed lamps to be used. The wrong one will result in a dramatic loss of light. Are you sure you are using the correct length adaptor? What condition is the heat filter glass in is it very old and scratched. This lamphouse does not use a very large sized mirror so if it's installed correctly then there will not be an issue with light passing in and onto the gate. There is no part on the vic 8 that would get in the way, apart from the safety and changover shutters. If it is as bad as you say then it can only be something so obviouse that you're missing it as this is a very good lamphouse over all What about lenses....  |  IP: Logged Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 06-11-2007 01:14 AM                     The adaptor is the correct one. I even re-ordered an adaptor for the 4K bulb that is used to re-check it and it was the same as the one we had installed. I am leaning towards the shutter blades being too big. This projector always had an issue even with the old Vertical lamphouse that was used. When we reinstaleld that lamphouse on a V10 the light was superb. Demetris  |  IP: Logged Neil Davis Film Handler Posts: 1 From: Hemel Hempstead, Herts, United Kingdom Registered: Jun 2004 posted 06-16-2007 03:52 PM                     Have you tried removing the 1.85 lens and running the projector, lamp on, in a 'black ball' alignment mode? you should have a black ring in the middle of the screen (Cathode cap) and this is in effect eclipsing the plasma ball from the xenon. do the x/y alignment so the light from the plasma is right 'behind' the black circle, then adjust focus so the ring of light is as neat as possible around the ring. Does this help things?  |  IP: Logged David Graham Rose Expert Film Handler Posts: 187 From: Cambridge, UK Registered: Sep 2002 posted 06-16-2007 04:16 PM                     Greetings All from Cambridge I have to take issue with Kenny McEverett and his statement that this is a good lamphouse overall. It is not. It is dreadful. Put a 4kW lamp in this lantern and just watch the mirror blister. Check the reflector coating. I bet all around the opening of the mirror there is no reflector. Goodnight David  |  IP: Logged Dave Macaulay Film God Posts: 2321 From: Toronto, Canada Registered: Apr 2001 posted 06-19-2007 11:03 AM                     If you're sure the working distance is right and the lamp gives good light with a V10, something is probably fishy with the V8 projector. Was the V8 a 35/70 machine? The 70mm shutter is different and passes less light in 35mm than the 35 only shutter. Try comparing it to another machine where you have good light. Do you have the original (Galileo?) mirror? A substitute might work better with the V10's barrel shutter light path.  |  IP: Logged Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 06-19-2007 11:46 AM                     From what i recall, and from what the manager told me, this projector never played 70mm but I would find it strange if it is equipped with a 70mm shutter! My last resort is to change the projector head with one from a closed down cinema. Is the last test I will do in order to decide if the problem is finally at the projector or the lamphouse. Demetris  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 06-19-2007 12:20 PM                        Barrel shutters are inherently "lossy." Louis  |  IP: Logged Demetris Thoupis Phenomenal Film Handler Posts: 1240 From: Aradippou, Larnaca, Cyprus Registered: Apr 2001 posted 06-19-2007 01:33 PM                     The V8 Carries a conical type shutter and not one with straight fins like the V4, V5 model. The barrel type I've only seen on the V10 model. Demetris  |  IP: Logged Ken McFall Jedi Master Film Handler Posts: 615 From: Haringey, London. Registered: Apr 2001 posted 06-21-2007 04:47 PM                     David I stand by my comments in that in my experience it is a good lamphouse. Simple to use and maintain and a good light. And being a metal mirror it's not quite so painfulk if a lamp fails..... I have not however used one with a 4k lamp in it. The max I've used is 3k and it performed very well. Good ventilation is, as with all lamphouses, a must! Certainly if the mirror has been overheated and blistered the light output will fall. It certainly does not deserve to be called dreadful! The vic 8 shutter while conical presents each blade behind the gate in the same way as a 'flat' shutter and is therefore no more or less efficent. I have changed the shutter in the past to the larger bladed, 70mm, version and cannot say there was a very noticable difference in the light on screen.  |  IP: Logged David Graham Rose Expert Film Handler Posts: 187 From: Cambridge, UK Registered: Sep 2002 posted 06-24-2007 03:25 AM                     Greetings Kendall I disagree. Everyone knows that this lantern is a heap of poo. No doubt you consider the xenon converted Super|Zenith450L an adequate lamphouse as well. David  |  IP: Logged Ken McFall Jedi Master Film Handler Posts: 615 From: Haringey, London. Registered: Apr 2001 posted 06-24-2007 09:31 AM                     David you are entitled to your opinion but I would appreciate it if you would use my name and not make assumptions on my behalf. There are a number of ways at evaluating projection equipment it's 'poo' rating is not one that I am aware of.  |  IP: Logged David Graham Rose Expert Film Handler Posts: 187 From: Cambridge, UK Registered: Sep 2002 posted 06-24-2007 03:29 PM                     Greetings Kennilworth I am indeed entitled to my opinion, and will have my say whenever possible. Having experienced your performance in the box and on installations you will no doubt be aware ofthe poo rating - a scale on which you invented yourself! From Cambridge Goodnight David  |  IP: Logged

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