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This topic comprises 2 pages: 1 2
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Author
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Topic: Proper lamphouse alignment... or???
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Jack Ondracek
Film God
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Posts: 2348
From: Port Orchard, WA, USA
Registered: Oct 2002
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posted 01-27-2004 11:40 PM
OK... where am I going wrong.. or???
I have one screen with an Ultra-80. It has what looks like a good reflector. It's positoned right, distance-wise, and is aligned with the world-famous "Align-O-Tron". It lights an SA/TA. In the same theatre, I have 3 Super Lume-X's, 2 of them with new reflectors. They're all running behing PRO-35's.
Bulbs are either new, or are well within initial warranty.
I have taken advantage of all manufacturers' instructions I can find, from Strong's "string" method to Greg's super-advanced laser pointer.
Still, I seem to have an ongoing challenge, keeping the middle of the screen from looking a lot hotter than the sides... quite a bit more so with the "ulra", but also to a lesser extent with the lume-x's.
I notice this on the features, but I see it more on things like trailer rating strips, which have, as far as I know, a relatively uniform colored background (green).
I'm wondering what I might be missing, since I've been to a few theatres across the water from me that have more uniform illumination than I seem to be getting.
Bulb focus doesn't seem to matter much... the hotter center is pretty much uniform relative to the sides, regardless.
I understand that when using measurement devices the sides aren't expected to rise to the level of the center, but I get the impression my setup is somewhat more noticeable... at least to me.
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Michael Schaffer
"Where is the Boardwalk Hotel?"
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Posts: 4143
From: Boston, MA
Registered: Apr 2002
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posted 01-28-2004 03:51 AM
As unlikely as it seems that Brad and I can agree on something, I also find it very difficult to get really uniform illumination without the hotspot from Strong lamphouses. And I have also align-o-troned those lamphouses, checked the projector head position, taken measurements with a light meter. However, I also have my little problems with the SLC consoles, especially with the motorized focus. When you move the lamp along the focus axis, it often looses its horizontal or vertical position. That makes good alignment a little tricky. Sometimes the motorized assemblies fail, then you are in for a lot of fun. I like the Christie rectifiers though. Best if you get a Kinoton lamphouse, then you get an efficient, even light output with a lamp 1 size down from competing products, and you also get a really massive solid focus assembly where you can ram your allen keys in, focus the lamp within 15 seconds, and which also keeps that focus.
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Monte L Fullmer
Film God
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Posts: 8367
From: Nampa, Idaho, USA
Registered: Nov 2004
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posted 01-14-2005 04:57 AM
..also, I'm Playing with 5 locations with ALL of them having those X-90 consoles-a total of 32 of them. With some built back in the late 80's and new ones built in '99.
...and I've having this "hot spot"/even field of light problem in almost all of them, esp the old ones.
Now, my big question, or wonderment is that (we acquired these locations about 3 yrs ago) if the bulb was set too far back in the mirror to where the mirror got too hot and slightly distorted the rear of the mirror causing this "hot spot"/focusing problem that we seem to hear about?
Yes,I've actually replace one mirror being that the old one was badly distorted due to excessive heat. Plus, the design of the mirror entraping too much heat, for as we know of these older X-90's (without that muffin fan in the front) with their somewhat weak air supply to cool down the ends of the bulb and move air around in a whole.
Yep. Christie SLC and Reference consoles are the way to go. Large mirror, not to much in a conical shape, lots of air flow from behind the mirror to cool things down real well, (and with a Reference console with that separate blower to cool down the anode when burning 6k bulbs) and a very sharp even field of light on the screen.
...and we all had manual mirror adjustments that used that long 9/64 allen key. Didn't believe in motorized adjustments.
-Monte
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