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Topic: Need help: Projection Films and Projector for 9*2m screen
Joined: Mar 28, 2018
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Hello all, new member here. Came here to receive some help and advise from you all, of course. I am planning to go for rear projection for my business. Please find the picture. Total image area size: 8.914*1.915 m, max. So, that'd be 9.1174 m diagonally or 358 inches, I surmise.

I contacted a few different suppliers online, but I am not completely sure if their suggestions will actually suit me. I did some research, however, I need more help from someone who won't suggest me products only to sell their own. So I want to consider your opinions and take a good decision, from the best of my knowledge. I hope this forum will help me with that.

I am looking for rear projection films and a projector.
I've been told 20sqm films (dark grey over white, light grey, transparent and black) will suit me better than screens for rear projection. I had also seen S-paint used for business purposes and Behr silver screen paint, but I am not sure if it will fit my use.
So, if dual/rear projection films are the best bet for me, what specifications should I be exactly looking for to suit me, like in gain, light transmittance and viewing angles?

Regarding the projector for the same, I have a picture which I will upload in the next post, in'shaa Allah.

If there is a better option for me which is more cost-effective, kindly let me know.


Final look we want to achieve.

468 × 432 pixels (72.45 KB)
Joined: Mar 28, 2018
Posts: 3
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As for the projectors:
I was advised this size would need 3 projectors or I use 2, but with up and bottom.
The size of the screen can be reduced too, if needed. I'll only need to find a projector which would suit me.
Note: I plan to project during the night only. If I can get to project during the day as well by investing only a slight bit more, I can go ahead with that as well.

So, this is the list of things I am looking for in a projector and also some of it is what I have been suggested to look for in the same. Let me know if these will suit me the best:

Image size: 8.9*1.9m max (can reduce accordingly)
Distance between the glass and partition/wall: 1.5m max
Projection content: Food photos and videos, dining/party/banquet hall photos, text

Other requirements:
- LED/laser only; DLP preferred.
- Short Throw.
- 20,000+ hours lifespan.
- Audio will not be used. So, not necessary at all. Also, 32dB+ noise won't be a problem.
- Will be used during night hours, so, very high lumens isn't required but high enough to avoid ambient light during the night as the building is located in a busy street.
- Manual+Auto keystone preferred.
- Contrast 3000+:1 (whichever is best suited for outdoor projection)
- 1080p at least.

Note: I intend to use only one projector. However, if two projectors will need to be absolutely used then the plan is to project two different images/videos at the same time, side by side, somewhat similar to the picture.
So, there won't be any overlap or need for edge blending.

1. Could you suggest which film color would give the best visuals for the same brightness/lumens?
2. And can we use screens for rear projection or only films? What are the average rates of each?
3. Is an UST projector's rear image not as clear as a ST's due to the mirror reflection?


Projector room measurements in mm.

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Joined: Mar 28, 2005
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I would probably ask for a design from an A/V Integrator with understanding that they will not get the follow-on build contrast. This can happen from a A/V design consultant.

This ensures that when you submit for bids, that all the integrators are quoting to the same design specification. It flattens the playing field and gives you a clear idea of cost.

The consultant should NOT include wording which requires the integrator to take responsibility for a 'full and complete' final design. That's the consultants job, and you should hold the consultant to that requirement as many consultants half-a$$ their work and copy and paste quite often instead of giving customers the actual engineering that they deserve.

If you don't want to go that route, I would talk to Stewart Filmscreen.

If the area of projection is outdoors exposed, then you need to use a PVC or glass screen, I expect, which is weatherproof and can sustain the building code requirements. Projection is always a 'film', but it can be built into glass materials or applied after the fact. It should live on the inside of the surface rather than the outside to help protect the material.

There are advantages to going to a mirror bounce vs. a direction projection option.

With a 9m wide screen, you will typically be dealing with 5.6m of projection height with a 1920x1200 projector. There is no changing the height the projector hits unless you use a specialized lens, or a mirror designed to compress the image height to what you need (both are possible).

So, something like the Panasonic PT-RZ970BU can do it, but even with their UST lens, you don't have enough room.

About .4-.9 is short throw, .3 or lower is really a UST lens, and with 1.4m to a 9m wide screen, you are very much in the UST category. Even with a .3 lens and a mirror, you don't have much room.

So, yes, two projectors seems to be the absolute minimum requirement.

I would recommend something like the Panasonic PT-RZ670 model which is 1920x1200 or the RW630, which is 1280x800. Depending on viewing distance, resolution may not matter.

Pair it with their UST lens, the ET-DLE030 and you will have a good 20,000 hour solution to what you are asking for.

The projector runs around $8,000 per unit, but the lens is an additional $5,000 per unit.

This setup should deliver about 43 lumens per square foot of screen space with a 9m wide image and two projectors side by side.

There are models in the same series with a bit more light output if you want to add 10% or more brightness to the setup.

Really, it depends on how bright things will be when in use, but rear projection really helps to combat ambient light in the space and preserve black levels.

You should talk more about what content you intend to show, where you are located, and what levels of brightness are being dealt with.

The drawing did help.
AV Integrated - Theater, whole house audio, and technology consultation during the build and installation process in the Washington, DC metropolitan area.
Joined: Sep 9, 2019
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Great advice you all post here. I appreciate.