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New PC's and Visuals
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GDR



Joined: 26 Sep 2008
Posts: 328
Location: EBBR

PostPosted: Tue Dec 07, 2010 1:22 pm    Post subject: Reply with quote

Hi Ivar,

Thanks for the info. I'm currently looking out for the Optoma TW610ST.
http://www.optomausa.com/Product_detail.asp?product_id=543.

The only thing is, I'm already searching for about a year to find a good model that answers to my needs. You're info definately helps me here. Thanks Razz .

Though, a question I've sent to several manufacturers is when using a curved screen what the angle (width) is. I'm planning to use 3 projectors to cover a FOV of 270° or a coverage of 8.00 meters (2*3.14*1.7m*(270°/360°)). With this model's width taken 3 times, I can cover it. But, then I need per projector an agle of 90° (plus maybe some extra to cover the blending). But, uptill now, I've never received a response back.

Does anyone has any information on this? I can't get them to test unless I immediately buy them. And they are a bit expensive for trial and error purposes.

Thanks in advance for the help Wink .

Geert
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Geert.

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melnato



Joined: 04 Feb 2006
Posts: 1087
Location: Australia

PostPosted: Wed Dec 08, 2010 3:49 am    Post subject: Reply with quote

Geert,

I dont think the manufacturers will ever answer your question.
Just too hard and they probably dont even know.

My screen is 8m long also with a diameter of 4.5m. I have a FOV of approximately 200.
I think FOV 270 is pushing it really. You will have to zoom out ALOT
and I personally dont think its realistic.
BUT thats just my personal experience...Im afraid you will have to buy them and test and play if you cant satisfy
yourself with the Projection calculator on their website...

Nat
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GDR



Joined: 26 Sep 2008
Posts: 328
Location: EBBR

PostPosted: Wed Dec 08, 2010 9:33 am    Post subject: Reply with quote

Hi Nat,

Thanks for the answer. I was already a bit afraid for the answer.
I'll continue to investigate. I'll post my findings once I get the issue resolved.

Geert.
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Full B737-MAX DSTD - ALL FDS
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CAVU



Joined: 05 Dec 2010
Posts: 15
Location: Cooperstown, NY

PostPosted: Wed Dec 08, 2010 8:18 pm    Post subject: Reply with quote

Ivars,

Here a projector I'm looking at:
Epson Powerlite 1730W
3000 Lumens WXGA LCD Projector
Projection Technology: LCD
Projector Type: Business Projector
Resolution: 1280 x 800
Native Resolution: WXGA (1280 x 800)
Brightness: 3000 ANSI Lumens
Contrast Ratio: 2000:1
No. of Colors: 16.2 million
Aspect Ratio: 16:10
Native Aspect Ratio: 16:10 Widescreen
Lens: f/1.58 – 1.68, 16.1 – 19.3 mm
Zoom: Optical zoom 1.0 – 1.2
Image Size: 30 - 300 inches
Throw Distance: 0.98 – 1.20 ft.

The numbers look good but I see no reference to DLP.
Epson says it uses a 3-panel LCD System

Quote:
A projector with the Epson-designed 3-panel Liquid Crystal Display ('3LCD') system uses dichroic mirrors to break the white light from the lamp into red, green and blue light. Each of the three colors of light is then passed through its own LCD panel and then recombined by a prism before being projected onto the screen. The result is smooth-moving images with rich, full color, since all three basic colors are included in each pixel of the projected image at all times.

The Technology Behind Other Projectors
After the 3LCD projector system, the second most common type of business projector is the 1-chip DLP™* projector system. These 1-chip DLP™ projectors create pulses of colored light by shining lamplight through red, green, blue and white*** parts of a rotating wheel.

These rapid pulses - thousands per second - are then reflected by a DMD™** device. The DMD™ device has one tiny mirror for each pixel in the image. It is on a hinge, and flickers rapidly. The series of rapid color bursts are then projected on the screen and seen in rapid succession. The viewer's brain can't pick out the individual flickers, but instead mixes the basic colors that appear one after the other in each pixel to come up with the final color the viewer sees.


And how does the throw distance relate.

Any feedback would be appreciated. BTW, what a great job on your cockpit shell. Beautiful. Are teh plans available?

Jim
Quote:
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Ivar Hestnes



Joined: 28 Aug 2006
Posts: 319
Location: Flemma, Norway

PostPosted: Thu Dec 09, 2010 12:29 am    Post subject: Reply with quote

Yeah, Epson uses LCD in their projectors, so it is not the best choice for night-flights because its limitations in showing black. I would go for BenQ or similar that uses DLP technology.

No words about the throw ratio in your specification there, but depending on your ceiling height you would aim for 0.5 to 0.6 for normal 2.4m height under your ceiling. That means the projectors dont need to be "crossed" and the risk of shell making shadows will be reduced to a minimum.

But as I have written many times, it is mandatory to make some drawings.
Smile
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Jetcos



Joined: 30 Sep 2005
Posts: 1248
Location: Newmarket,Ontario

PostPosted: Thu Dec 09, 2010 11:29 am    Post subject: Reply with quote

Ivar Hestnes wrote:


But as I have written many times, it is mandatory to make some drawings.
Smile



Also measure twice and cut once!
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CAVU



Joined: 05 Dec 2010
Posts: 15
Location: Cooperstown, NY

PostPosted: Thu Dec 09, 2010 6:29 pm    Post subject: Reply with quote

Hi again,
This projector is $200 cheaper than the BenQ but the online calculator showed this and the BenQ as comparable projectors. I'm not familiar with the nomeclature of 2 cm DLP (Is this a 2 chip system?) Is that better than a single? THe contrast is 2000 vs 2400 in the BenQ. BTW, the calculator is a real eye opener to what you get. I was reading that that model f the BenQ is no longer available. Is there a replacement model?

Mitsubishi EW230U-ST
Brightness: 2,500 lumens
Lamp Life: 3,000 hours
Resolution: 1280x800 (WXGA)
Contrast: 2,000:1
Throw Distance: 0.5 - 3.1 m Aspect Ratio: 16:10
Warranty: 3 years
Technology: 2 cm DLP

Ivar, I know you get a lot of requests to help, so don't feel compelled to respond. Its basically a post to keep the discussion going on visuals and options to lower the cost, if possible.
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melnato



Joined: 04 Feb 2006
Posts: 1087
Location: Australia

PostPosted: Fri Dec 10, 2010 4:24 pm    Post subject: Reply with quote

Jim...stick to DLP Smile

That Mitsubishi you mentioned above is the new replacement of my own
projectors....Im very happy with them.

Nat
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