[Diyeitor]

Hi everybody

My projector from Spain.

My config:
Long trhow lens kit: 135 mm triplet lens, 2 fresnels 15,5" 330 mm focal lenght
tft 17" lg1730s 1280x1024, 550:1 16 ms
osram hqi-t 400w n/si 3800º k

These results are provisional. I still lack to finish the box and to place the optical reflector. The fresnel lens are both behind the tft and I will prove to put one in front.

A few shots from my provisional and unfinished setup











Every time I am tuning more. The projection lens has divided it now in 3 lens that you leave totally adjustable, transforming it into a variofocal lens with aberrations correctiosn with the midle lens and we have been able to tune more in its good point. I have made the pictures projecting on foscurit cloth, before on the wall. The lamp is better located and we have optimized the placement of the fresnels. We have also assured a but it completes darkness in the room.

In the topic of dvd reproduction and hddvd I have optimized the software player. Now I work with zoomplayer+ffdshow, with which you can apply filters that improve the final quality, very useful for dvd, less necessary in hddvd. Our projectors don't have those filters so it is necessary to use those that it offers us the software from codecs or players.

Here many shots from "Shark tale" and "Star Wars, clone wars":









more shots in the second post

[Diyeitor]

More pics:

[Diyeitor]

Star Wars Episode 2

[Diyeitor]

[Miklopolis]

Totally Sweet. Nice job! I really need to start a 17" project.

Did you get the lenses and triplet from lumenlab?

[Diyeitor]

Hi Miklopolis,

no from lumenlabs, but I don't know if I must to say this here. The lenses kit are from Diylabs because they are sufficiently big ones for my 17" monitor and the triplet enough lens to catch the whole size inside thanks to their focal lenght. At the same time, I have been able to transform this lens into variofocal and to still adjust more a more perfect focus corner to corner.

[twallclimber]

beautiful job. i dont see your fresnels in box. are they front and back lcd ?

[Diyeitor]

twallclimber, on Mar 14 2005, 03:37 PM, said:

beautiful job. i dont see your fresnels in box. are they front and back lcd ?

Yes, in this picture the fresnels lens aren't placed. if you notice, the fresnels were located behind the lcd. In that moment the box was partially disassembled. Before, we had both fresnels joined but then we have separated them more, always behind the lcd. Now we want to prove to place one before and other behind, to see that contrast gain and light can have.

[KingOfSwords]

Ah...I was wondering if this project was ever going to make it over here. Nice results. Are you getting full focus now or is there still a little loss of edge focus?

[hoodain]

Great job on the PJ! I am in the middle of building a 17" panel, your results are encouraging.

I have to say that seeing such great results with DIYPC's 135mm long throw lens confuses me. In this post Brain states (in bold, no less) that this lens will not work with a 17" LCD panel. These results appear to contradict that statement. Anyone have any insight? I need to make some decisions about which optics to use.

[Diyeitor]

Hi KingofSwords, you have a good projector and amazing progress

I can catch a perfect focus now from corner to corner. I get this increasing their focal lenght, approaching more the 3 lenses from the 135 triplet lens, but for question of screen size I have the lens with a focal lenght something smaller. This causes, as you say, a little loss of edge focus but anything appreciable from where I see it. The question is to know how to play with the distances among each one of the 3 eyeglasses that compose the triplete to get gain in contrast and clarity

[Diyeitor]

hoodain, on Mar 14 2005, 08:07 PM, said:

Great job on the PJ! I am in the middle of building a 17" panel, your results are encouraging.

I have to say that seeing such great results with DIYPC's 135mm long throw lens confuses me. In this post Brain states (in bold, no less) that this lens will not work with a 17" LCD panel. These results appear to contradict that statement. Anyone have any insight? I need to make some decisions about which optics to use.

Hi Hoodain

Brainchild, has something of reason. Mainly for the topic of the compatibility between the fresnels focal and the triplete focal lenght. The question is in the focal distance and to get a good focus and light. I have been able to fix that problem. (see my previous comment). This is the solution. In 16:9 it is perfectly clear with the regulation of manufacture. But with my adjustments I get that the corners in 4:3 fullscreen also recover part of their clarity, always varying and tuning the distances between the midle lens and the other ones two.

[sjetski71]

wow, just wow, that picture quality has me floored. Your camera caught a lot of the detail.

Diyeitor, maybe i've misunderstood but it sounds like you took apart your triplet to realign the lenses within, if so was it easy to do?

[akrapovic]

wow!

[Squalish]

Really good pics.

Could you take closeups of the center + corners to show how the screendoor is?

[twallclimber]

Diyeitor, on Mar 14 2005, 11:51 AM, said:

Yes, in this picture the fresnels lens aren't placed. if you notice, the fresnels were located behind the lcd. In that moment the box was partially disassembled. Before, we had both fresnels joined but then we have separated them more, always behind the lcd. Now we want to prove to place one before and other behind, to see that contrast gain and light can have.

<{POST_SNAPBACK}>

ahh got it.. thanks dude...

[this-is-me]

Let me guess... you are using ffdshow with some sharpening enhancements? Did I catch you with your hand in the cookie jar?

[stealth403]

this-is-me, on Mar 16 2005, 03:43 AM, said:

Let me guess... you are using ffdshow with some sharpening enhancements? Did I catch you with your hand in the cookie jar?

<{POST_SNAPBACK}>

Whats wrong with that? Just that he didn't mention it upfront?

[this-is-me]

What I mean is that the percieved quality of the picture taken immediately improves, but may not do such a good job in person. Having ffdshow on is like pre-photoshopping an image before posting. It does not show "real" projector results that can actually be compared to other projectors unless the other projectors also have the same filters added to them.

[mhelin]

Why are some images a little bit grainy? Is it because of the lack of color support of the panel (18-bit vs 24-bit colors) or fddshow filters? Or is it just the camera?

This post has been edited by mhelin: 16 March 2005 - 07:06 AM

[Diyeitor]

this-is-me, on Mar 16 2005, 04:45 AM, said:

What I mean is that the percieved quality of the picture taken immediately improves, but may not do such a good job in person. Having ffdshow on is like pre-photoshopping an image before posting. It does not show "real" projector results that can actually be compared to other projectors unless the other projectors also have the same filters added to them.

<{POST_SNAPBACK}>

How I can explain this to you? As I have said before, I use ffdshow to improve the reproduction quality and I use it the whole time, don't for make only the picture. In the commercial projectors this characteristic this added so I don't see where it is the problem of using filters because we try to do the movies with the best possible quality, whenever the pc allows it. the LG1730s is 18bit color, as most of the tfts. The problem of the ffdshow is that if it abuses too much of him it can produce artifacts in the borders and in the way that the color is represented.

That grain is so much product from the camera and the ffdshow, the digital cameras sometimes have this problem of incorporating noise to the image under certain conditions of light

P.D.: the shots from starwars: clone wars don´t have any filter applied, I only use it for the dvds because it helps to enhance the smallest resolution in my 1280x1024 projector, only for that reason

This post has been edited by Diyeitor: 16 March 2005 - 11:53 AM

[this-is-me]

I never said there was anything wrong with using ffdshow. I plan to use it myself once everything is up and running. What I am saying is that your excellent results cannot be compared to other projectors unless they also have ffdshow turned on. That was my only point.

[fore1337]

Great Image Quality!

Does this mean that a 17” project is feasible right now, given available optics?
(By piecing together optics from LLabs and DIYprojectors or other suppliers?)

Plz help me out here guys.

[11steve11]

fore1337
I could be mistaken, however after reading this thread it seems that there is some confusion about the other triplet. The element diameter is 135mm (about 5.3") but 'effective' focal length is 450mm, (which seems plenty large enough for throwing an image using a 17" panel.)
Just a suggestion, I'd check with whatever supplier directly to make sure the product will work for your design before ordering as after reading another forum there seems to be an issue on it working with a 17" panel.

This post has been edited by 11steve11: 17 March 2005 - 05:16 AM

[SethAce]

Hrm, I'm tempted just to test a it with a new 17" LCD panel, that according to our monitor list should strip. In 60 days when I get back to the states, (Deployment soon over) Then, I'll do the 17" and I'm going to make a 15" also, since I already have the LL 15 kit..

we'll see how it goes.