i found a 15"LCD.
400:1!
19MS!
TV,S,VIDEO INPUT
only CNY:2600!!!
if it's price down again,i would to use it,
it is a very hard to the projector.
change a big fresnel lens
change a glass in the three lenses than get longer focus
maybe that is defeat
400:1!
19MS!
TV,S,VIDEO INPUT
only CNY:2600!!!
if it's price down again,i would to use it,
it is a very hard to the projector.
change a big fresnel lens
change a glass in the three lenses than get longer focus
maybe that is defeat
There is a link somewhere in this sea of calamity for a place that sells glass fresnels of many different sizes. Some as big as 18"x18" if I remember correctly. I wish I bookmarked it.
Large fresnel lenses.
There are some at Edmund Optics that are large but not glass. The large ones are quite expensive. Take a look at.
http://www.edmundoptics.com/IOD/DisplayProduct.cfm?productid=2040
Exipnos
There are some at Edmund Optics that are large but not glass. The large ones are quite expensive. Take a look at.
http://www.edmundoptics.com/IOD/DisplayProduct.cfm?productid=2040
Exipnos
If anyone on here could find a place that sells bigger projection fresnels for relatively cheap that would be great. The biggest I can find is 11.25"x11.25". I assume that if we found a place that sells bigger ones we would still have to buy 2, since they are doubled in OHPs.
I don't know about you guys, but the fresnel on my current OHP (3M 9850) is a very tight fit as it is. No way I could put something bigger in. However, the plastic boarder that holds the top glass, is cutting off like an inch of the current fresnel on all four sides, as well as a huge section of the corners. I'm thinking that if I could cut this stuff down, there'd be almost enough room for a 15" panel. But I don't know if the optics will work well like that.
My second idea is this. I've come to the realization that LCD's don't like to have the display size changed. Every one I've seen does not allow vertical size adjustment. Some allow horizontal size adjustment only, but that doesn't do much good unless you like your image disproportionate.
There has to be a software solution to this. A way so that your OS displays your desktop to use only 90% or so of the full screen, and drawing a black border so that the LCD thinks it's using the whole screen. Sort of like lowering the resolution without zooming in to fill the screen (I hope that makes sense).
I have no problem with losing a 100-200 V and H pixels if I had 1600x1200 to begin with. 1500x1125 would be fine and dandy with me. I think that's the only way to go unless we can find a 14" SXGA+ screen (1400x1050), which I haven't been able to. My other concern is that all the LCD controllers I've seen don't support SXGA+.
My second idea is this. I've come to the realization that LCD's don't like to have the display size changed. Every one I've seen does not allow vertical size adjustment. Some allow horizontal size adjustment only, but that doesn't do much good unless you like your image disproportionate.
There has to be a software solution to this. A way so that your OS displays your desktop to use only 90% or so of the full screen, and drawing a black border so that the LCD thinks it's using the whole screen. Sort of like lowering the resolution without zooming in to fill the screen (I hope that makes sense).
I have no problem with losing a 100-200 V and H pixels if I had 1600x1200 to begin with. 1500x1125 would be fine and dandy with me. I think that's the only way to go unless we can find a 14" SXGA+ screen (1400x1050), which I haven't been able to. My other concern is that all the LCD controllers I've seen don't support SXGA+.
I found a place that sells fresnel magnifiers for 12" up to 26" TV. Apparently people use these things to magnify TV. They sell one for 16-20" TVs, But anyway, I figure that I could stack 2 of these things and use them with a 15" lcd if I made my own box to hold it all. this place is cheaper than edmund scientific. they say they are 2X but i'm not even sure if this is powerful enough, does anyone here know the strength of OHP fresnels? if anyone is interested:
http://www.optelec.com/ProductDisplay.asp?ProductID=140
http://www.optelec.com/ProductDisplay.asp?ProductID=140
What if the screen is elevated? I know someone on this forum was trying to build this trapezoidal thingy. Even if it does work though, I'm not sure there will be any way to focus it. I'm gonna try it out tommorow.
hi,
does anyone has expierence in the cheap fresnels from http://www.diyprojectiontv.tk/ . It's about 14" (i think..) for 6$ including the shippingscosts. I doubt the quality of them though..
dirkje
does anyone has expierence in the cheap fresnels from http://www.diyprojectiontv.tk/ . It's about 14" (i think..) for 6$ including the shippingscosts. I doubt the quality of them though..
dirkje
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