Thanks Remy, I made the aperture cicles (i've found the metrics in another post), like a tunnel, it improve the contrast, i think i'm close to the best ...
Hi Leonadro, If your image is too big, it is because you have a focal length which is too short like I told you in my previous post.This means your lens'...
Again, thanks for help. About brightness vs sharpness, i'm testing different sizes of apperture circles, with different distances between them. Less distance =...
Hey Leonardo, That's where the secret resides( distance between the two holes and the sizes ) It took me 6 months before I found the exact measurements which...
I've build some variations of the box model, and I still searching the best brightness/contrast solution. I saw on the internet another design, called here at...
No this will produce a brighter image. On the contrary it will not ather the max of light. Keep the box srtaight leandrocnaumes <no_reply@yahoogroups.com> a...
Remy, sorry but i don´t understand your answer... Let me see if i understood Trapezoid shape - increases (only) brightness Two-box model - Lets you work best...
No trapezoid decrease brightness You should keep the boxes straight and not trapezoid. I use three box model. The fresnel lens you use must be very big, as big...
I will be using a 17" Flat Tube CRT Monitor and the Apollo Full Page Magnifier from Office Depot. I will have a HD signal as well as a standard cable signal...
CRT Monitors DO NOT WORK FOR "TVprojection" CRT Monitors are not bright enough. Apollo magnifier is not a good lens, it is too small and magnification is 3X...
a fresnel lens which is at least the same size of a 19 inch tv screen. focal lens of min 450mm. and use a good all CRT TV and not a computer monitor. tv screen...
Hello guys, I'm researching the net and i've found a near parent to OHP projector, it name is EPISCOPE and basically is a opaque picture projector. It can be...
Has anyone tried to use that magnification lenses instead of fresnels? I have two of them and one has about 10mm diameter. Is there anything i can do with this...
Dear members , Thanks for reading my Email, I want you to know that I`m new to this group , I had read all your information it seems that there are so many...
Aye, quick question... why can't the TV Screen be flat? It seems that a flat TV Screen would be a good thing, since the Fresnel lens is flat. I have a sharp...
Hi it's Remy, The tv screen must not be flat to compensate the curvature that occurs when magnifying the screen with a fresnel lens. The more you magnify the...
Hi guys - Bones here still reading and watching. re the curved/flat screen scenario, I can't get my head around the effect of various picture tubes and lenses...
Hello everyone. Glad to see you're all still around. I've been really busy with life and work (mostly work). But I'm still enjoying my crt setup. Gave up on...
I read the FILES section, but still have a few question. Guys I want to make a projector using my 17 inch crt monitor, because I want a high resolution output...
Unless you have a very bright CRT monitor (there are very few out there) you will have a very dim image using a CRT computer monitor. I tried this with two of...
I've decided to go the overhead projector with a lcd route. I'm building my screen out of smooth panel board with glass beads. claygraner <claygraner@...>...
I just assembled a quick version of a DIY Projector. I used an old refrigerator box...some duct tape and a magnifying glass lens I found in a desk at work. ...
You cannot add light inside the focus box. All that will do is wash out the image. You have to have more lumens from behind the source which in this case is...
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