Official Sony VPL-VW500ES / VW600ES 4K Projector Thread - Page 133 - AVS Forum
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post #3961 of 3966 Old Yesterday, 11:10 PM
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Originally Posted by AV Science Sales 5 View Post
It definitely was a Black Diamond electric, but from what you are saying, it might have been the 0.8 gain.
Would a low gain hotspot that badly? From the seating position the middle was very bright and the edges and corners were dark. Typical vignetting like in the old photographs. It was a very 'directional' screen.
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post #3962 of 3966 Old Today, 07:48 AM
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Would a low gain hotspot that badly? From the seating position the middle was very bright and the edges and corners were dark. Typical vignetting like in the old photographs. It was a very 'directional' screen.

If the throw is too short it certainly will. The 0.8 gain requires 1.5 screen widths minimum and I would not use the minimum.

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Actually the screen is most likely not a low gain, even though it ends up being a low gain screen by the final number. It depends on where it's starting point is. If it started at .5 gain and then by the time SI is done with their process, it moves the gain up to .8, then that is a 160% increase in gain. Same goes for the Stewart FireHawk. Everyone thinks of it as low gain, since it is 1.1, but it also requires a 1.5 screen width throw. The FireHawk starts at something like 0.8 gain base and then optical coating are applied to bring the gain up to 1.1.

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post #3963 of 3966 Old Today, 09:53 AM
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Would a low gain hotspot that badly? From the seating position the middle was very bright and the edges and corners were dark. Typical vignetting like in the old photographs. It was a very 'directional' screen.

That doesn't sound like it was set up correctly. I think Mike hit the nail on the head.

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post #3964 of 3966 Old Today, 10:40 AM
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That doesn't sound like it was set up correctly. I think Mike hit the nail on the head.
I remember, years ago when I was testing screen samples for my first Sony projector (VPL-VW50 - the Pearl), that I saw this high directionality from two Stewart grey screens. I believe it was the Firehawk G3 (?) - not sure - but one of them was specifically designed for the Pearl projector (SST?). Due to strong hotspotting, I decided they were not suitable for my HT - 133 inch diagonal, 16:9 format, 15 feet throw, seating at 12 feet - and went with Da-Lite Cinema Vision (and later with the HD Progressive 1.3). I am pretty happy with my current screen but what I saw Saturday - intense hotspotting and horrendous sparkling - reminded me that grey screens may not work for certain application. It was certainly looking bad at that dealer and did not present the 1100ES in a good light (pun intended).
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post #3965 of 3966 Old Today, 11:01 AM
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I remember, years ago when I was testing screen samples for my first Sony projector (VPL-VW50 - the Pearl), that I saw this high directionality from two Stewart grey screens. I believe it was the Firehawk G3 (?) - not sure - but one of them was specifically designed for the Pearl projector (SST?). Due to strong hotspotting, I decided they were not suitable for my HT - 133 inch diagonal, 16:9 format, 15 feet throw, seating at 12 feet - and went with Da-Lite Cinema Vision (and later with the HD Progressive 1.3). I am pretty happy with my current screen but what I saw Saturday - intense hotspotting and horrendous sparkling - reminded me that grey screens may not work for certain application. It was certainly looking bad at that dealer and did not present the 1100ES in a good light (pun intended).
The wrong screen / screen set up does a good projector a complete disservice.

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post #3966 of 3966 Old Today, 01:49 PM
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As has been stated, the color of the screen does not have much to do with anything under discussion here. The gain of a screen is simply the multiplication process of the various gain layers the screen consists of. with a non white screen and in effect many white screens, the gain of the substrate layer is less than unity (Unity is one). Gain layers can be printed on or spayed on. The best screen material out there for a non acoustically transparent screen PQ wise is in my opinion Stewart Snomatt 100. The substrate material for this screen is just under 1.0 and a very tiny amount of gain material is sprayed on this fabric to bring it up to one. Even for this material, a minimum throw distance should be about 1.25. For screen like Studeotec130, the sprayed on gain is about 1.3 and a throw minimum is 1.3. more is better. For screen materials where the substrate material is substantially less than 1.0, the final gain divided by the substrate gain will closely approximate the sprayed on gain. The sprayed on gain will represent the minimum throw multiplier. let's take Firehawk G3 or LS. The final gain is about 1.25 and the substrate gain is about. 0.8. conservatively, a minimum throw for this material is 1.6. the new firehawk has a gain of 1.1 and starts with a 0.8 gain substrate. Conservatively this gives a minimum throw multiplier of 1.4.




Why is any of this? It has to do with the angle of the light coming from the projector lens and hitting the screen. this angle is not constant of course but depends on a variety of factors. The longer the throw multiplier one uses for set up, the less the worst case angle will be. In olden days, commercial theaters were much longer than they were wide and the projector was mounted in the rear. High gain screens were and are still used. No problem with long throws.


For home use, err on the long side to minimize screen material induced artifacts.


All this of course is for angular reflective screens. Retro reflective screens, the only real example is Da-lite HP of whatever gain and rebranded uses of this material. Throw is not really relevant though this material has its own weaknesses which thankfully most don't see because they are happily blinded by the light.




The screen industry has become like the older days of speaker manufacturing. Anyone can easily enter the screen manufacturing business without knowing very much. Many screen manufacturing companies do not specify very much re the fabrics they use and recommended minimum throws.

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