wondering for a future project,which is the way to go? Other than the physical size difference of the 2 panels.Which one is the best to use?I`m guessing that the 15" lcd panel would have a better picture?
Thanks
Thanks
15" LCD do have a higher resolution and most have higher contrast. so yea. they will give a better picture.
but also, like you stated, they also require a larger enclosure.
but also, like you stated, they also require a larger enclosure.
15" lcd it is
Thanks,
I thought that would be the case.When the time comes I will make sure I get a 15"lcd with great specs.For myself, I will choose to have the best picture at the sacrifice of a compact unit.I am very happy with my overhead panel/overhead projector setup and can see going to the next (and last?)step next year.
Thanks,
I thought that would be the case.When the time comes I will make sure I get a 15"lcd with great specs.For myself, I will choose to have the best picture at the sacrifice of a compact unit.I am very happy with my overhead panel/overhead projector setup and can see going to the next (and last?)step next year.
One thing you forgot, the bigger the lcd the more and worse off you are in the abberation distortion department.
Trev 🙂
Lilliput all the way mate, check my results,
http://www.diyaudio.com/forums/showthread.php?s=&threadid=39818
http://www.diyaudio.com/forums/showthread.php?s=&threadid=39818
abberation distortion?
light abberation or spherical abberation? cuz a triplet should kill all that.
light abberation or spherical abberation? cuz a triplet should kill all that.
A triplet wont cure aberations on such a wide angle, both spherical and light aberation will get worse the wider you go at a set distance from a lamp, all of our designs have this problem, many just have failed to either realise what it is or havnt said anything. The only setup with minimum distortion is a parabolic type system both being a parabolic light source and having the light from the lcd traveling in a parabolic manner. Pro projectors do this now days as they have acheived in making smaller panels, my first projector was in this way and i can tell you there is a big difference both in clarity and brightness, the way we do things is cheating to keep our lenses small and costs down. But with the panel sizes available to us diyers, we dont have too much choice.
Shperical aberations comes from the reflector when using a large arced lamp, and using a spherical reflector with too much of a curve.
Trev🙂
Ive got a 15" panel (tiny bit of it is hidden) on an OHP with a single element lense. It is pin sharp from corner to corner and through the middle, no distortion or aboration of any kind. I installed a triplet and that made it distorted - go figure. Personally I can't stand the screendoor on anything lower than than a 15" TFT, it seems to be come hugely more noticable on smaller panels especially if you are going for a very large cinema screen size picture like me.
thanks
thanks guys for the advice, I guess I`ll go with the liliput.I mean if the picture would be the same or better than the 15" lcd then I can have a good picture WITH a smaller projector!
I just have to do some more reading and searching on which of the liliputs model number to get as I remember reading that there are ones that won`t work,some that are ok and others that are the best(the model I would be getting)
thanks guys for the advice, I guess I`ll go with the liliput.I mean if the picture would be the same or better than the 15" lcd then I can have a good picture WITH a smaller projector!
I just have to do some more reading and searching on which of the liliputs model number to get as I remember reading that there are ones that won`t work,some that are ok and others that are the best(the model I would be getting)
Crappy cheap quality triplet is your answer and thats why i use the copy lens, also it could be becuse your top frensels focal is miss matched with the triplets focal.
That all depends on the pixel size, (ppi).
Trev🙂
ace3000_1 said:
Might be the reflector cos I put the reflector in at the same time as the triplet. I didn't know this could cause distortion until I read your previous post. I think ill try taking it out.
If its not at its focal sure, shperical aberation is like a blurred light effect of a misty light, but i would have to say that with the triplet you have that would be a major cause of the problem.
Trev 🙂
i doubt its the reflector, i dont think it can affect the shape of the image (like a fish eye effect, thats a spherical abberation, as far as I know) That 135mm triplet I saw for sale for 119.99 US, i think at diylabs, gave a perfect projection of my 17" flat crt monitor (but very dark). The best part is, I got the lens very cheap, Im not 100% sure its the one that 119$ but it looks identical in specs and looks. I got mine off an old opaque projector. It cost me all together with handling and taxes, 15$ US.
ace3000_1 said:
I don't think I've posted details of the triplet I have. Its the one from Diylabs which most people rate as pretty good, maybe I got a dodgy one. I think I'll just put my single element lens in which gave a perfect picture in the first place (whats so good about triplets anyway?).
I had a good idea that you had that lens, i have one here too, in the past i did a comparison with the copy lens and the diylabs triplet, and im telling ya, the diylabs triplet is crap compared, its ghoshy and misty and that how i know its your lens more then your reflector.
If your current system works fine with a singlet, forsure stick with it, singlets are a brighter lens then any triplet as we have less light loss due to the fact we have less lenses that the light has to go through. The only real reason we use triplets for is to get an image thats crystal clear from edge to edge, but with shperical abberations and distorions from our frensels in the way we make our systems having a ever so perfect image isnt possible, though we can get it close. Afteral we dont sit 1ft away from the screen.
Trev🙂
ace3000_1 said:
Its not ghosty and misty though, its just out of focus around the edge, or if I focus the edge its out of focus in the middle 🙂 I can't really tell watching films, just on text. and computer graphics.
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