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Author
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Topic: Heat Filter Orientation
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Frank Angel
Film God
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Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
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posted 07-25-2002 01:59 PM
Ok, I finally got heat filters for an Orc 4500W lamphouse (they came with no instructions of course). The filters have a small paper dot on one corner of the class. Should I assume that the dot is an indication of how the glass is to be orientated in the holder? Dot towards the bulb, dot away from the bulb? Or doesn't it matter at all which way they are facing? If it would be better to talk to the manufacturer to get an answer, does anyone know if ORCON is still in business and if so, do you have a number I can call to get an answer. And then if these filters do need to be oriented in a particular way, is there a way to tell by looking at the glass itself, because the other machine has filters with no marks on them at all and I have just been putting the glass into the holder any which way. Any help would be appreciated. Thanks, Frank
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Phil Hill
I love my cootie bug
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Posts: 7595
From: Hollywood, CA USA
Registered: Mar 2000
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posted 07-26-2002 02:23 AM
Hmmmmm...although I have never seen it, I suppose it is possible to coat both sides of the glass...why? I don't know.The idea is that the IR coating reflects the heat back away from the film without going through the filter "glass". In higher-power lamps (7kW, 10kW, 12kW, 15kW, 20kW), if the heat is reflected through the filter glass, it will overheat and crack the filter. Most times the "hot" or lamp side is somehow marked. That is the dot or the arrow or the "Towards Lamphouse" sign. Sorry, that's all I know.... ![](http://www.film-tech.com/ubb/smile.gif) >>> Phil
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Pat Moore
Master Film Handler
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Posts: 363
Registered: Mar 2000
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posted 07-26-2002 07:54 AM
Frank -- that dot should be towards the lamphouse. Most coated filters, if marked, would orient the mark towards the light source.That bulletin on our website might help. Touch the tip of a pencil to the glass surface. If the pencil seems to actually contact its image, that's the coated surface. If the image doesn't touch but looks to be about the thickness of the glass away from the pencil tip, that indicates the coated surface is on the other side. Yes, Strong bought what there was of ORC back in '93, though what we really coveted was the Century Projector line. Pat
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