resolution
>QA-1650 will be as good as the Ask Impact WSX
I don't know the response times, contrast ratios, or how much light they both absorb, so I would not make a sweeping statement like that. I seem to recall that the Ask has more color depth. That would make a difference.
All I am saying is that if you use that single RCA jack with NTSC format video, then having LCD resolution higher than 640 by 480 will not give you a sharper image.
The Maxim data Application Note is very nice, but I think their pixel counts are for the Y portion of the image: The intensity. NTSC does have a lot more resolution in terms of dots on a monochrome CRT screen. The limitation is that all the color information is carried by the phase of a 3.579545MHz MHz carrier. With 63.5 microseconds per scan line, that would give you only about 227 different color areas per scan line. But it is even worse than that, because lots of that 63.5 microseconds is non-displayed sync and overscan.
NTSC is the 1953 color upgrade of the 1941 TV standard!
>QA-1650 will be as good as the Ask Impact WSX
I don't know the response times, contrast ratios, or how much light they both absorb, so I would not make a sweeping statement like that. I seem to recall that the Ask has more color depth. That would make a difference.
All I am saying is that if you use that single RCA jack with NTSC format video, then having LCD resolution higher than 640 by 480 will not give you a sharper image.
The Maxim data Application Note is very nice, but I think their pixel counts are for the Y portion of the image: The intensity. NTSC does have a lot more resolution in terms of dots on a monochrome CRT screen. The limitation is that all the color information is carried by the phase of a 3.579545MHz MHz carrier. With 63.5 microseconds per scan line, that would give you only about 227 different color areas per scan line. But it is even worse than that, because lots of that 63.5 microseconds is non-displayed sync and overscan.
NTSC is the 1953 color upgrade of the 1941 TV standard!
"All I am saying is that if you use that single RCA jack with NTSC format video, then having LCD resolution higher than 640 by 480 will not give you a sharper image."
That is what I was meaning. sVideo isn't really any sharper either is it? Just better with colors I think.
Anyway, pepe303's post is what I was talking about.
"But doing the same with a 100:1 panel would lead to 25:1 final contrast ratio on the screen, and your friends will laugh on you when you present them such "results""
I think the 100:1 I'm getting with an Ask Impact WSX and a 3M 9200 is pretty darn good. None of my friends have laughted at me yet. I am sure that by spending more time and money it could be better . . . but still, to say 100:1 is laughable?
I am waiting for an Elmo a305sd that should be in Thursday. Them I'm going to build a projection cabinet like on inventgeek. I think once I control for all the light leaks I'll have a pretty good image. Even if it is at a "pathetic" 100:1. I'm also getting a QA-1650 that I picked up cheap. I can't wait to compare its 60:1 to the Ask 100:1.
That is what I was meaning. sVideo isn't really any sharper either is it? Just better with colors I think.
Anyway, pepe303's post is what I was talking about.
"But doing the same with a 100:1 panel would lead to 25:1 final contrast ratio on the screen, and your friends will laugh on you when you present them such "results""
I think the 100:1 I'm getting with an Ask Impact WSX and a 3M 9200 is pretty darn good. None of my friends have laughted at me yet. I am sure that by spending more time and money it could be better . . . but still, to say 100:1 is laughable?
I am waiting for an Elmo a305sd that should be in Thursday. Them I'm going to build a projection cabinet like on inventgeek. I think once I control for all the light leaks I'll have a pretty good image. Even if it is at a "pathetic" 100:1. I'm also getting a QA-1650 that I picked up cheap. I can't wait to compare its 60:1 to the Ask 100:1.
s-video
S-video is MUCH better:
http://en.wikipedia.org/wiki/S-Video
http://m2.aol.com/ajaynejr/vidcolor.htm
But since VHS recorders and broadcast video are bandwidth-limited (because they both use NTSC composite video format), connecting them to your monitor, TV, or projector with an S-video cable will not help.
You have to use a source that actually has higher resolution to begin with like an HDTV tuner, a satellite decoder, a digital cable decoder, or a DVD player. If you connect one of those to your projector using the S-video interface, then you will get 2-3 times the horizontal resolution.
I have a DirecTV decoder and a small video-to-VGA converter for my 1024 by 768 LCD projector. I have both composite NTSC and S-video connections between the DirecTV decoder and the converter. When I switch between the two interfaces I see a huge difference.
S-video is MUCH better:
http://en.wikipedia.org/wiki/S-Video
http://m2.aol.com/ajaynejr/vidcolor.htm
But since VHS recorders and broadcast video are bandwidth-limited (because they both use NTSC composite video format), connecting them to your monitor, TV, or projector with an S-video cable will not help.
You have to use a source that actually has higher resolution to begin with like an HDTV tuner, a satellite decoder, a digital cable decoder, or a DVD player. If you connect one of those to your projector using the S-video interface, then you will get 2-3 times the horizontal resolution.
I have a DirecTV decoder and a small video-to-VGA converter for my 1024 by 768 LCD projector. I have both composite NTSC and S-video connections between the DirecTV decoder and the converter. When I switch between the two interfaces I see a huge difference.
575 Watt MH Bulb
Here are a couple places that have the 575 Watt HMI bulb listed for about $100. That is the cheapest that I found.
http://www.microlamp.com/osram.htm
http://www.bulbconnection.com/ViewItem/bcrw/itmid/434/oc/HMI 575W/GS/item.html
I actually do not own a projector that uses these bulbs and obviously have not actually purchased a bulb from either of these sites. I was considering getting a Dukane 680 and just doing my home work on bulb costs before I bought an overhead projector. 😉
Here are a couple places that have the 575 Watt HMI bulb listed for about $100. That is the cheapest that I found.
http://www.microlamp.com/osram.htm
http://www.bulbconnection.com/ViewItem/bcrw/itmid/434/oc/HMI 575W/GS/item.html
I actually do not own a projector that uses these bulbs and obviously have not actually purchased a bulb from either of these sites. I was considering getting a Dukane 680 and just doing my home work on bulb costs before I bought an overhead projector. 😉
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