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This topic comprises 3 pages: 1 2 3
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Author
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Topic: Can anyone identify the object between the lamp and projector here?
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Stephen Furley
Film God
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 12-30-2009 06:31 AM
I've just typed a reply, hit the wrong button, and lost it. ![[Frown]](frown.gif)
quote: Mitchell Dvoskin
Whatever that gizmo is between the lamphouse and projector, it has an Alan Gordon Enterprises logo on it. They are still in business in LA, I suppose somebody could call or email them to find out what it is.
Alan Gordon Enterprises
My GUESS is that it is some sort of heavy duty heat shield to allow for freeze framing the image.
I tried saving the pictures and zooming in on the nameplates, but couldn't make out what it said. It probably helps if it's a name and logo that you know.
So far we have:
Two suggestions that it's a lamphouse. It certainly looks like one, but I don't think my idea that it's for a halogen lamp really makes sense with 35mm. Bernard's suggestion that it's for a small xenon is interesting, but if it's for a smaller lamp wouldn't the Orcon rectifier over-run it? If the lamp in the Orcon is the same size then why use the other lamphouse? It's possible that the Orcon has failed, but it looks in good condition, almost new, as does the rest of the equipment.
One suggestion that it's to correct for non-standard mirror. Wouldn't it be easier to replace the mirror? It's a standard lamphouse, and standard-size film. I think this would be more likely if it was illuminating something non-standard like 28mm film, or the works from a video projector, which somebody was trying to get more light into. Also, the cables look rather too thin for a lamp.
Two suggestions that it's for adjustable colour filters. Sounds plausible, but I can't see any way to adjust the filters, either three knobs to do it locally, or some means for remote control, a thickish cable with multi-pole connectors maybe, or even mechanical cables as used on bicycle brakes; can't think of the name for them now.
One suggetion that it's for neutral density filters. Again, sounds plausible, and the same arguments apply as for colour filters.
One suggestion that it's a spacer to facilitate access to the lamp. I think this is unlikely; what are the wires for? Changing the lamp the conventional way isn't difficult, and doesn't have to be done very often, unless this is used for some portable application, in which case the extra box itself is a nuisance anyway. The lamp would be in the wrong position, which would require a lens to correct it; this might explain the wires if they were for a fan to cool it, but this itself might then require re-alignment after changing a lamp. It really doesn't seem to make life any easier.
Five suggestions that it's some sort of cooling device. Three of the people who suggested this mentioned still-framing, which would make sense, since this seems to be some sort of studio machine; motor on top spool and cloverleaf bottom spoolbox. It wouldn't be needed for running film normally with such a small lamp, or all projectors would need one, which they clearly don't.
I'm still surprised that nobody here has been able to positively identify it. Of course it's possible that it's some one-off set-up that somebody has put together, e.g. a small lamphouse that somebody has stripped out and used to hold filters of some sort, in which case asking the maker may not help. Zooming in on this thing the black side plates do not look original. I can't be sure, but they also look like plastic, which would suggest that there's probably not a lamp in there, since they'd get rather hot.
I think at the moment I'm leaning towards the cooling device, with the colour filters as the next most likely, but I still can't see any way to operate them.
If it does turn out to be a cooling device then Ian was the first to suggest it, and indeed, it was the first suggestion made.
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Ian Parfrey
Phenomenal Film Handler
Posts: 1049
From: Imbil Australia 26 deg 27' 42.66" S 152 deg 42' 23.40" E
Registered: Feb 2009
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posted 12-30-2009 07:56 AM
Stephen.
I've had another look at this thing and from what I can tell, the top piece of the "box-thing" is off another Orcon lamphouse like the one behind it. Inside these are a large computer fan used to cool the power supply and for xenon heat extraction in the Orcons, so at a guess the wires - instead of dropping down from underneath the fan housing and into the original supply- are in this instance brought out the side and to the outboard power supply.
I'm leaning towards a 45 degree, angled dichroic filter in that box which would reflect the IR out the top and through the fan to be exhausted, similar to the Xebex HiBeam IV lamphouse setup.
With that said, then what stock would be so sensitive to heat that it would require a 1000w max lamp with dichroic filtering apart from nitrate? As there aren't any magazines on the Century, then it would be madness to even try and run nitrate on that setup.
And anyway, the Century has water cooling so why the dichroic filtering if any? Surely it would be far easier to cool the gate with the water jacket in the projector head than go to the expense of fabricating a seperate unit?
The manual for the 1600B model lamphouse states that the aperture to bulkhead distance should be approximately 8" ( 20.3 cm), and it appears that the present position of the Orcon far exceeds that recommended distance. This particular model lamphouse doesn't appear to be the 1600B model but the 1000 model. In which case, the aperture to bulkhead distance is likely to be shorter, not longer which is where it resides now.
Additionally, I doubt that the "box-thing" would be a beam expander as the Century doesn't appear to be a 35/70mm model.
This is turning out to be quite the puzzler!
The game's afoot, Watson.
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Stephen Furley
Film God
Posts: 3059
From: Coulsdon, Croydon, England
Registered: May 2002
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posted 12-30-2009 08:26 AM
Now somebody has made another post I can correct the error in my previous one. The sentence 'Also, the cables look rather too thin for a lamp' should of course be at the end of the previous paragraph, not where I actually inserted it.
quote: Ian Parfrey
With that said, then what stock would be so sensitive to heat that it would require a 1000w max lamp with dichroic filtering apart from nitrate? As there aren't any magazines on the Century, then it would be madness to even try and run nitrate on that setup.
And anyway, the Century has water cooling so why the dichroic filtering if any? Surely it would be far easier to cool the gate with the water jacket in the projector head than go to the expense of fabricating a seperate unit?
Ian, to answer the second point first, water-cooling would reduce the temperature of the gate, but would not reduce the direct radiant heat on the film itself. As to what sort of stock would be so sensitive as to need this, three people have suggested stock which is not moving. Given that this seems to be some sort of studio machine, with rock and roll facilities, I'm leaning towards this being the most likely explanation, and it's to enable a still frame to be held in the gate, but we still don't know for sure. You're right, that does look like the top of an Orcon, mounted in reverse. I hadn't noticed that.
By the way Ian, are you posting this in the middle of the night? It was 14:26 in London when it arrived.
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