ANDY-FV005 10.4" Toshiba @ 250W HQI-TS

[slize]

i finally added a cover for the objective to secure it from dust, while the beamer ist not in use...

[mengalva]

Hey Slize,

What a great job man !!!! it is a very pro design ... congratulations

I have a question for you of an old topic you posted in this forum that I found trying to solve my projection size. Its about the solution you did to solve your short focal length using an eye glass lens, quere is my situation:

I made my projector with a 5" PS1 LCD and used the fresnels and triplet of an 3M ohp, both fresnels are 330mm FL and the triplet is 330mm FL too. The room where I will use my projector just allow me a throw distance of 2.4mts between the triplet and the screen so that give me a 32" image. In your summary post you mentioned this:

"...because when there is room between the ohp lense and the eyeglass the focal length decreases and that means the picture goes wider.."

My intention is to decrease the focal lenght of my 330mm triplet up to 180mm so that will give me a 60" or 65" image with your metod:

- Triplet lens with a fl of 330 mm = 0.33 m = (1/0.33) 3.03 dioptrien
- My object size should be 1.524 m (diagonal)
- My throw distance is 2.4 mts

so my ideal lens would have an fl of 180 mm = 0.18 m = 5.5 dp

that means my adiotnal lens must have 5.5 - 3.03 = + 2.47 dp

Can you tell me if these maths are right?
Can the result be a positive dp(+ 2.47 dp?
The lens must be for a farsightly or short-sighted person?

Thanks in advance !!

[Hezz]

Slize,

Just saw your project. Great execution. Very well crafted.

Hezz

[jcbklyny]

One of the best designs I've seen! Great work

[slize]

up

[Rox]

100% agree with everibody. COngratulations,

just wonder, what size is the screen?

[Sarna]

As he stated his screen was "diagonal 1,90m (75"), 1,50m (60") wide and 1,10 (43") height", I guess you ask about his Toshiba 10,4" lcd.
From the pdf official specsheet (can't find a link to it in english right now, only in german, so no worries...).
Outline: 241.5W, 171.9H, 5.5D.
Active area 210.432W, 157.824H.
In mm of course. I've got the toshiba 10.4" stripped next room so I can check it if you want.

[Rox]

sorry i didn´t read it. So it is 74" diagonal screen;

74/10,4=7,1 magnification

focal=34,5

then lcd-triplet distance (D) should be 1/34,5=1/D+1/7,1D
D=39,3cm so 7,1x39,3=280cm throw moreless.

Now, 39,3cm and 10,4" lcd has 37 degrees field angle from the triplet. Its a very good setup, mean the lens is working on good contitions. I believe you have very good focus in full image.

[Me2!]

That is a fine looking projector. I think anyone would be happy with that in their house. Good Job!

I like the use of curves and balance to the shape. Very artistic. Also very efficient use of space. I think its the best ive seen. Have a well deserved cold one dude

[nick[x1]]

Thats one of the best projectors i have even seen looks amazing!!!

Shame mine dosent look anything like it