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This topic comprises 3 pages: 1 2 3
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Topic: Lamp Flicker or (unstable arc?): noticeable during end credits
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Monte L Fullmer
Film God
Posts: 8367
From: Nampa, Idaho, USA
Registered: Nov 2004
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posted 11-03-2007 11:28 PM
quote:
ASL (Advanced Specialty Lighting) is the newest generation of what used to be known as Perkin Elmer - and before that ORC.
And how many times did I cuss and swear at those cursed ORC bulbs!!
I used to work for a small circuit that was smart and was using Osrams.
Then, they begin to get stupid in going down to Hanovias.
Then, they really "dumbnified" themselves down to a horribly stupid and very cheap level by thinking on saving money with switching to ORC's. By doing this, ORC's failures were occuring like changing your socks on a daily basis.
In a six month period, we went though so many ORC's on returns due to loss of gas, or even explosions that my lamp card was halfway filled up and the owners just couldn't believe the failures and was blaming me for poor installs with poor connections.
I finally proved to them that it was definitely poor manufacturers to where they FINALLY gained some intelligence to go back to OSRAMS - by spending that extra pocket lining that they took earlier for better quality.
Now, a few years later, they decide to go "stupid" again with trying Perkin-Elmers, which right off, I knew those were those confounded ORCS, and sure enough, here comes the problems once again. And once again, in realizing that of their stupidity in saving the buck, that you just don't mess with quality and a good price when it slaps you in the face. They, again, went back to a good bulb, this time with Christies.
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Michael Moore
Expert Film Handler
Posts: 188
From: Dover, DE / USA
Registered: Jun 2006
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posted 11-04-2007 09:43 AM
quote: Louis Bornwasser
"Can you run the film at another theatre and see if you have the same problem?"
Carmike is scared of me in Dover Delaware and told me to stay out of their booth. They had a problem with putting Saw 1, 2, and 3 together a week ago (my brother in Law did not know how to put a movie together, he was going to call me to do it and the General Manager told him no! "do it yourself” my bother in law only knows digital, has never touched a film print in his life and they made him both manger and he is only 19!!!)
Let’s put it this way it was a big mess and when the next theatre gets those prints I can only pray for them.
That’s another story for another time. They are the closes theatre to me
quote: Darryl Spicer
"it's the damn credits. I have seen this issue for years. The quality of credits now days suck. If the picture looks great with no annoying flicker during the movie but then you notice it in the credits. It's the credits."
Speaking of this has anyone here projected this movie? Have they had the same issue?
quote: Monte L Fullmer
"Course, Michael has one of Louis's SA's with that shutter conversion (which I've heard really makes the SA more of a better machine, but it's still a projector with a revolving shutter that cuts the light at 48hz and as that previous topic mentions and what even Steve mentions on different brands of machinery: it could be the projector, not the lamp, mirror or rectifier."
Monte
The projector is the last thing I would suspect. Reason for this is I have had no problems with it and I find the nitpicking of shutters to be unfounded. The differences are not that great that you or I can tell the differences. A well maintained machine, Century, Christie, etc.; will give you all comparable results. Put them side by side you might see something different but come on. picky picky picky!
I find my Hadden Century to be quite excellent.
quote: Richard May
"This may be a stupid reply but check your shutter timing. Could you have been seeing ghosting on the credits?"
Not a stupid question, I once thought I had a ghosting issue because when I projecting "The Wind that Shakes the Barley" i noticed during the darkest seems, I thought I could see ghosting but in actuality it was not, It was at this time I started questioning the bulb. That was several months ago, and I kind of forgot about it because everything else I have projected I have not had an issue with until now.
I called Louis about it and he did say it could be the Lamp house alignment and with the Kenisley's it is very critical to get it just right. So i may have to go back to the alignment.
But you know when I look through that sight glass the arc does not look too stable it does dance a little and kind of upward but when I change the position of the magnet it does not do a thing to the arc. I checked the magnet and it is in the correct way and not backwards. I will check tonight after the show, tonight is the last showing so I'm going to make another adjustment to the magnet and see how it looks.
As for the 3 phase, the line comes into the booth and is feed into a 3 phase transformer, and then that line goes to my rectifier.
I am going to check that line voltage tonight...
Thank you all for you help so far.
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Steve Guttag
We forgot the crackers Gromit!!!
Posts: 12814
From: Annapolis, MD
Registered: Dec 1999
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posted 11-04-2007 04:08 PM
quote: Michael Moore
nitpicking of shutters to be unfounded. The differences are not that great that you or I can tell the differences.
Actually that is quite easily proven incorrect and you will find that many if not most people that work with the varioius projector designs can tell the differences rather immediately. Now, how important the differences are to a audience that does not have the opportunity to compare the two (i.e. run a changeover booth with one each, Simplex and a Century) are not likely to notice any particuar problem or have a preference. As one that sets up predominately 2-projector systems, I strongly discourage mis-matched machines for this very reason, regardless of brand/model.
Now back to the topic at hand. You say the arc is licking up...that would indicate that there is not enough magnet in there. If the magnet is inserted backwards, it would always lick up since it naturally would lick up and the magnet in reverse would push it that way. So I would verify that it is in correctly and that it is as high as it can go or as close to the arc as it can go and possibly space it up further, if possible to bring the arc in the center. You can also try rotating the lamp...it is possible the electrodes are slightly off center and causing the arc not to be centered.
Now if the picture, sans credits, look flicker free, then odds are it is the credits. Normally solids like the preview "green band" are things that show up flickers more if it is lamp related.
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