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Topic: Question about video projectors
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Phil Murat
Jedi Master Film Handler
Posts: 671
From: Villeneuve St Georges, France
Registered: Dec 2015
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posted May 27, 2019 09:45 AM
Hello Bob,
I don't know if this is answering to your question , I have got a Benq W1090 a few months ago, this is a great machine (and simple to use) !! ....... For 549 Euros around (Sometimes less) . Technical Features are outstanding for this price. Some machines much more expensive are not so good.
From my side, Only used for DVD, no games, No 3D at this time
UPDATED ON 05JUNE19.
No "Rainbow effect" to report at this time. If possible, ask the vendor a demonstration for different projectors but with same DVD (your reference movie) [ June 05, 2019, 08:47 AM: Message edited by: Phil Murat ]
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Rob Young.
Phenomenal Film Handler
Posts: 1633
From: Cheshire, U.K.
Registered: Dec 2003
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posted May 28, 2019 02:01 PM
The current domestic technologies are;
Single Chip DLP machines which use a spinning colour wheel to break down the illuminating light source into essentially RGB and then bounce it off the Texas Instruments Digital Mirror Device (with variations) and thus produce an on screen colour image.
Problem has always been that you see a constantly changing colour image as its colour components upgrade one by one on screen to produce the colour spectrum.
Sadly, most of us can see it's "trick" and are prone to notice the rainbow effect, even with a 6 x speed colour wheel.
Although, DLP does have very fast response time, so a smooth image with regard to on screen movement.
3 chip DLP machines do away with all this nonsense and provide a stable colour image, but are very expensive. Your local cinema probably uses one.
Single chip / colour wheel machines are a cost cut, and a domestic response to early LCD technology which still hangs on.
LCD essential employs three LCD panels to respond to RGB. Early versions were prone to dust on the panels (DLP always used a sealed optical housing) and could only produce "black level" by closing all three panel pixels. Now, as such, they could only ever produce grey as black, so contrast was average (much, much better with todays Panasonic machines).
So, for years you have these competing techs with both pros and cons.
Hence why a lot of us stuck with film!
LCOS (Liquid Crystal on Silicon) technology uses a combination of the wisdom.
It is currently used by Sony and JVC. It employs 3 reactive LCD chips, but, the light source is essentially bounced off of the three chips (always 3 chips to provide a constant colour on screen image into the lens) and produces very film like images.
Sony and JVC use competing technologies, however, JVC's LCOS is by far the better.
They call it D-ILA.
However, it struggles to produce very bright images in ambient / daylight scenarios, but in a dark room is by far the most cinematic.
"Digital" projection is so different today than when many of us film nuts threw stupid money at trying to replicate our favourite media back in the day with "video" based tech. DVD was always a limited compromise. HD (HD-DVD) Blu-ray was always the answer to a decent projection source.
So, today, we have a choice of totally acceptable cheap, bright, one off projection for a few hundred quid, or experience a more cinematic / filmic digital presentation for a bit more investment...hmmm...sounds just like choosing a super 8 projector back in the day.
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Chip Gelmini
Phenomenal Film Handler
Posts: 1733
From: Brooksville, FL
Registered: Jun 2003
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posted May 28, 2019 06:37 PM
Video Projectors: The other side of owning one.
Bob Pucci recently asked for recommending a video projector. The replies were interesting. I’d like to change it up a bit, and ask this question. What about the inputs and how to select them.
I like the video projector I have, the older Panasonic AX-200-U. It does a lot of things I do like. The only two things I don’t like is the nasty on screen message when you power down. It asks if you want to power down. Why does it do this when yes, I am pressing the button to power it down!
The other thing it does that I do not like is what it doesn’t do. It does NOT have random access to the inputs. For example let’s say I am in component mode and I want to switch directly to HDMI 1. Well, it doesn’t do that.
To go from component to HDMI1, I have to cycle through all of the inputs after component and before HDMI1. And that goes the same for aspect ratios.
In my career I was taught to go from mono to stereo, and from flat to scope in an instant to give only the best presentation for the audience. I’m referring to my 35 years as a cinema projectionist. And yes I know these video projectors are made for home and they are going to be high tech up to a certain point.
So dealing with this stubborn issue, I found a way to solve it.
First, I choose component input on the projector and connect from a switchbox direct to the projector input. Once set it means I only turn the projector on. I do not touch the inputs on the projector.
Next, I run three DVD players (2 standard def and 1 Blu-ray) into the switchbox.
Now, I set each of the DVD players to a specific aspect ratio. The first SD player is 4 x 3 letterbox. The 2nd SD player is 16 x 9. The Blu-ray is 16 x 9 maximum resolution. Load the disc into the player of which the disc is formatted.
So when running the discs, I can simply press the preferred button on the switcher, and the aspect ratio and the input is selected immediately.
I add a small flat screen monitor to the setup with its own switch box and connect the players via yellow composite. Handy when cueing up a disc to first frame via chapter selection, or cueing up a feature disc to first frame near the end of a homemade trailer disc.
So like my super 8 or 16mm, I have DVD changeovers to boot.
As for that on screen power down message. I stop that from going to the screen with a standard open/close 35mm changeover shield. The message is still there. But it goes on the shield just one inch out from the projector lens. Never on the screen.
Food for thought depending on how creative the rest of you are feeling.
~ Chip Gelmini ~
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Paul Adsett
Film God
Posts: 5003
From: USA
Registered: Jun 2003
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posted May 28, 2019 08:13 PM
All good recommendations from Chip. Also worth mentioning, if you hook up all the video and audio inputs directly into a modern AV/Receiver(with just a single HDMI cable going up to the digital projector) you can label each input electronically so that it appears on the AVR display,and you do all the signal switching to the projector at the AV/R So I have the following inputs displayed on my AVR display: SONY BR, Panasonic DVD, CD, FM, SUPER 8. As far as aspect ratio goes, the Panasonic AE4000 and many other medium cost projectors such as the higher end Epson's have motorized zoom and focus with lens memory functions. This way you can zoom and focus academy 4:3, widescreen 16:9, CinemaScope 2.35:1, and any other aspect ratios to the individual screen size you want and store it all in memory. So when I have say a Cinemascope video, I just press Cinemascope on my remote and the picture zooms out to the full 10ft width of my screen, automatically focusses and shifts up/down to center the picture perfectly where it needs to be. So the lens memory feature is a great thing to get for a professional looking presentation.
-------------------- The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection, Elmo GS1200 f1.0 2-blade Eumig S938 Stereo f1.0 Ektar Panasonic PT-AE4000U digital pj
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Paul Adsett
Film God
Posts: 5003
From: USA
Registered: Jun 2003
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posted May 29, 2019 01:50 PM
Sounds like Baird's original spinning disc mechanical TV scanning system! It used to be that DLP projectors had a significant contrasr advantage over LCD projectors. I'm not sure if that is still the case as LCD projectors now have excellent contrast ratios. I have seen a huge contrast improvement on my 2014 Panny AE4000 compared with my existing 2004 Panny AE700. The early DLP projectors were infamous for rainbow artifacts and a significant portion of the population could see them, and a small proportion of those reported headaches, dizziness, nausea, and even seizures. I think improvements in the color wheels have greatly reduced, but not entirely eliminated, these issues.
-------------------- The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection, Elmo GS1200 f1.0 2-blade Eumig S938 Stereo f1.0 Ektar Panasonic PT-AE4000U digital pj
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Rob Young.
Phenomenal Film Handler
Posts: 1633
From: Cheshire, U.K.
Registered: Dec 2003
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posted May 30, 2019 02:44 AM
Paul, I agree that the recent Panasonic LCD projectors are excellent.
If you saw the rainbow effect on older DLP's, you'll still see it.
Granted that faster colour wheels reduce the effect, but it's still there.
Actually, as Texas Instruments developed Dark Chip 2,3,4, etc. the contrast improved, as in the blacks were darker, but imo they started to loose shadow detail as well.
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