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Most Elmos have a glass heat shield between the bulb and the gate. Some recommend removal of this heat shield which will increase the light output by about 5%.

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On the other thread James says this. It is a general question, what this glass heat is for? Why only Elmos (I knew ST1200 has it) has it not the other projectors?

Any harms to remove the glass from Elmos?
 

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Posted by Yanis Tzortzis (Member # 434) on April 01, 2009, 05:24 AM:
 
I guess it's for protecting the film frame from getting burnt by the lamp heat during still frame show-a feature that only the ST1200's & GS1200's have I think.
Don't know about removing it-guess it won't affect the projector's function,but obviously don't use the still frame if you do....
 

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Posted by Winbert Hutahaean (Member # 58) on April 01, 2009, 06:07 AM:
 
I don't think ST 1200 has the still frame feature.
 

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Posted by Paul Adsett (Member # 25) on April 01, 2009, 07:08 AM:
 
It's for the still frame capability. In the GS1200 it automatically swings out of the way when in the normal running mode.
 

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Posted by Chip Gelmini (Member # 44) on April 01, 2009, 08:26 AM:
 
The ST 1200 should have still frame.

A common problem is the shutter will stop in the closed position and block the light. For this reason, pull out the inch advance knob in front of the focused lens on the main frame. This will slide out to make contact with gearing. By hand, you can briefly adjust the shutter position to put the light through. The picture below shows this knob and shaft above the elevation knob...

The picture will look darker in still mode, as a protection shield drops down behind the shutter wheel to prevent frame burn.

If your ST1200 is working properly, you should be able to do it.

cg



[ April 02, 2009, 12:12 PM: Message edited by: Chip Gelmini ]
 

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Posted by James E. Stubbs (Member # 817) on April 02, 2009, 08:58 PM:
 
Winbert, the glass heat shield I'm talking about is the one contained in the lamp housing. It's in a round window w/ a slit/break through the middle. It's designed like this so that heat doesn't crack the glass. (I'm sure other projectors have these as well.) It's there to protect the film in the gate from excess heat during regular projection. The swing down heat shield is for still projection only. Don't mess w/ that if you want to use still projection or you'll get shrinky dinks on the screen! It also protects the film in the gate from burning when going from forward/reverse projection as it drops down momentarily during the switch.

Steve Osborne of The Reel Image fame suggested I take out the glass to increase light output by 5%. I've not done it yet but will now. See the photo. It's a good thing I took it out to show you as the glass was filthy!
Cheers,
 

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Posted by Graham Ritchie (Member # 559) on April 03, 2009, 12:13 AM:
 
I would not recommend removing the split glass shield. The reason is "lamp cooling" is blown from the bottom... up.. there is a lot of hot air that needs to directed out the top of the projector, removing the glass will instead cause much of that hot air from your lamp to instead be blown forward towards the gate area and your film its not a good idea. The GS1200 has a small aperture baffle plate with "extra cooling" that blows in the area between the back of the plate and the gate, thats how the GS1200 is set up cooling wise without any need for a split glass, by removing that glass in you ST1200 you are going to have some of that hot air heading the wrong way.

Graham.
 

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