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Topic: Sankyo Dualux 1000 Image Vignetting
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Jenny Gilchrist
Junior
Posts: 6
From: Sydney, NSW Australia
Registered: Jul 2015
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posted July 16, 2015 07:42 PM
I have a question about the heat shield glass - the Sankyo 1000H I have (bought from Frank - it's a gorgeous projector) has had the heat shield glass removed. It was probably dirty or broken.
However, I have melted a few spots in my film which is really awful, this is due to my father having spliced them together and occasionally a splice jams, not often, but sometimes. I also can't use the still feature at all or I'm worried it will melt.
Can you get replacement heat glass? I've looked but can't see it.
I also have a question about the telecine setup Janice has as pictured earlier in this thread. (I have the same telecine reflectors, and the same projector.) However, though I won't go into detail here, I get a ghosting image when I project through the telecine. This ghosting is only on one side of the figure or item, not a halo all the way around. The projection goes onto the glass and out through the 'screen', it's the screen that has the ghosting (almost a double) image. Easier to see on brighter figures like a white t shirt or skin against dark background, and always a ghosting to the right of the figure. Any ideas? First I thought it was 'line up' of the mirror/screen or projector, but definitely not, no matter where I move it (and it's supposed to be perfectly aligned on the marked 'mat') the ghosting is still there.
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Jenny
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Ty Reynolds
Film Handler
Posts: 93
From: Calgary, Alberta, Canada
Registered: Nov 2015
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posted November 18, 2015 11:01 PM
Jenny - I bought the same box and had the same result. According to the instruction manual, "A ghost-like image may sometimes occur. The ghost-like image may be reduced by making frequency adjustments to your camera..." Frequency adjustments?
What the manual says is nonsense. The ghosting is caused by the manufacturer installing the incorrect mirror. Instead of using a proper first-surface mirror, which reflects the image only from the front, this unit has a conventional mirror. The image passes through the glass, and is reflected by the coating on the back surface. With the mirror at a 45 degree angle, this means that not only is the image reflected by the back surface, but there is also a faint image reflected by the front surface. This is your ghost.
It surprises me that the manufacturer of an optical device does not know this basic fact. But what is really annoying is that they try to bamboozle with b.s. and blame the operator's other equipment.
If you do a google search for first-surface or front-surface mirror, you'll find more articulate explanations of how they work and why they're used.
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