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That's great regarding the 2-bladed shutter, but my Elmos don't have a blue-tinted heat shield glass (it's clear), and if it did, where would you get the transparent clear glass to replace it that Steve talks about?
He also implies that no one should have removed the glass to begin with.
With reference to my other post regarding that two blade shutter conversion and the heat proof glass on the lamphouse cover . Yes that heat shield was never meant to be removed . I did a test with the heat shield removed and with it on . I found that the machine runs cooler with it on with the clear transparent glass . With it removed the gate , the lens and the projector metal cover runs hot enough to cause concern after running about 1200 feet of film . Even the green plastics get hot too. Not a good thing for the mech or the films . Blimey you could fry an egg on it given time . Also there was no significant light loss .
But that was with the 2-bladed shutter, right? I removed mine almost 30 years ago and haven't had an issue with a 3-bladed shutter. Is your glass shield tinted blue? I'm still confused by that article, which makes it sound like clear shields are available for people who want to swap them out.
"This is desirable because that original glass is heat-proofed and tinted blue, which impedes illumination on your screen! By replacing this original glass with a completely transparent, colorless glassall the possible light is transmitted to your screen!"
That's a busy website. Hard to find stuff. Can't search because much info is part of graphics not text.
Had a look at my old ST1200 glass and looking through it outside I could not see any difference, however placing a white strip of paper behind the glass there is a indication of a very slight blue tinge to the glass, and I do mean "very" slight. I don't see any need to change it, its probably been there since new. I wonder if it UV resistant? The only time I would replace it if the glass is when gets that fogged up look, other than that I wouldn't bother. Regarding replacement glass, you could always cut and use glass that is used for 35mm slide frames, still plenty of that stuff floating around. Anyway I will stick to keeping the glass in place, its better, with a more controlled air flow away from the gate, and of coarse the film
Based on empirical evidence of around 30 years, the heat shield glass in unnesessary with the stock lamp and 3-bladed shutter. The decision to remove it or leave it in is purely personal.
Brian you may be correct there regarding the three bladed shutter and the heat shield glass . I can't recall my previous 3 bladed shutter ST 1200 HD's i used for giving both public and private films shows ever running as hot as the modified 2 bladed one does . They did a lot of projection hours sometimes . However i do remember the heat shield glass on my previous machines having a slight blue tint . It is unfortunate i no longer have a 3 bladed one in order to empirically compare it with the 2 bladed modified machine as regards the heat and the light output differences .
I wouldn't worry about -- yes, leave it in for the 2-bladed machine.
I'm still curious about Steve Osborne's statement about "replacing this original glass with a completely transparent, colorless glassall the possible light is transmitted to your screen!" Does he sell them? Does it come with the 2-bladed shutter? It's very confusing on that rather busy page that lists everything but the kitchen sink with graphics galore. You gotta keep scrolling and scrolling. That website is stuck in the 90s.
It wouldn't be easy to somehow fashion ur own piece of glass. Any glass cutters here? Plus, if it's not the right type of glass and thickness it could be disastrous and shatter. A very confusing statement he made.
I like the cartoons, personally. I've never met him in person, but know that he has been a long time friend to the film community, so some slight encentrisities are acceptable 😀
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