Bout time I have a go at this projector building stuff!!!

[ace3000_1]

The only time I have seen rings on my screen was when I moved the projection lens so it focussed on the fresnel instead of the LCD.

Yeah thats normal, thats why we dont have the top/bottom frensel against the lcd. I am talking about the frensels rings reguarding my last post. What happends is when you go too far off axis of the frensels contoured rings angle they get a negative effect. The rings that are missalighned to your light will go dark and show in your image. Another thing that will happen is the grassing affect, (same thing as having the rings missaligned from one frensel to another).

You get big differences in the light on the other side just by moving it a few millimeters.

Yeah thats right you soon know when your in the right spot. On a bigger frensel your soon going to see that its alot more sensive then a small.

Trev

[HiLLBiLLY]

hehe...see Trev told ya that pic you gave me would get used again if i just waited :-p

BIG fresnel :-)

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[HiLLBiLLY]

We might have a few "issues" with the Administrators of the MCG (Melbourne Cricket Ground) when we approach them and tell them we want to "strip" their 20 odd foot LCD panel though...not too mention rip the rows of lamps off the towers...u can ask em Trev :-p

[ace3000_1]

hehe...see Trev told ya that pic you gave me would get used again if i just waited

Ya, they are the ones i cut up for the lilliput .

...not too mention rip the rows of lamps off the towers...u can ask em Trev :-p

Nothing like the old fire cracker round the lamp post mate, how bout i do that and you play catch with the light?

Trev

[NottaClu]

i was reading in another post somthing about tilting the fresnels and lcd screen to get better contrast??? I know if I tilt the rear fresnel I get keystone correction...but what is this about contrast...anyone help???

[ace3000_1]

I know if I tilt the rear fresnel I get keystone correction.

Only the front.

but what is this about contrast...anyone help???

Its basically just changing the veiwing angle. All lcd's are different in their specs regarding veiwing angle and the contrast change, realy i dont find it useful as its just the same as if we are changing the contrast in the settings.

Trev

[NottaClu]

i always mix up which fresnel I am talkin about...

yo trev...you got an email
drew

[ace3000_1]

yo trev...you got an email

Now you have

Trev

[Dazzzla]

hehe...see Trev told ya that pic you gave me would get used again if i just waited :-p

Here's some cooling to go with that.

DJ

[HiLLBiLLY]

Here's some cooling to go with that.

HAHAHA....Ok all we really need now is a copy lens with a diameter of 3 meters and we are set :-p