Cant say im loving the idea of 'experimenting' with AU$400 (me thinks 8' by 4' is too small, so need 2) of acrylic mirror by painting a mix on it. Particularly cos down under we aint got no stenkin' HD or Lowes etc, so I can never be sure of the resalt given I'll have to substitute ALL ingredients...
So, what about laying a thin say .5mm sheet of diffuse white matt plastic over the top. Probably has been done? Or a fine white veil or cotton sheet or........You get the idea. There a sooooo many cool sheet plastics with different surfaces, somethin's gotta work.
Still wanna paint? What about thin 'clear' sheet over the mirror first,(cheep too) then paint. This way different mixes and even thickness of coats can be tried.
All this also allows using joined mirrors cos the mirror surface is no longer being projected on.
This one for example 'sounds' interesting....
http://www.mitchellgroup.com.au/mp/product...px?productID=13




- RIP Steve Irwin -

I thought Elken had a LF screen made using paint available in Oz.

Don't waste your money on the mirror. I tried LF with my LL projector and it just doesn't work. I now have a Sanyo Z1 and still see zero advantage when using the mirror over my Parkland Plastic screen.

Would have thought that our relatively low light pj's would benifit most from the mirror concept. Sounds like you didnt achieve the "LF" effect. Cant help but think poor resalts may be due to one of the many sensitive variables of the paint application being not ideal. This is why I like the idea of being able to easily try different products as they are discovered, including paints. Much like what many do here as new lamps, optics etc are discovered. Btw, is the parkland thin and translucent? Did you ever try it 'over' the mirror?

If you want to experiment by all means go for it. I would start out small. I would hate to see you spend alot of money on a huge mirror when you could have achieved the sames results with a piece of $15 painted mdf.

As far as the theory LF acutally requires more lumens because the light has to pass through the paint and bonce off the mirror and through the paint again.

Also be sure and check at the DIY Screen Section at the avsforum.com . There is alot of research and debate about LF.

Parkland plastic is a white vinyl product used for showers. It is flimsy so it has to be mounted to something. It is equivalent to a matte white screen. 15$ at Lowes

[edit]Nevermind... not really the right thread for my original post...[/edit]

anakin

Have a look at a fellow aussie's non painted mirror ideas at:


http://www.diyprojectiontv.com/The_Ultimate_Screen.pdf

another with different materials
http://www.diyprojectiontv.com/THE_ULTRA_H...GAIN_SCREEN.pdf



I did say non painted also to note they are made for lower lumen diy crt projectors

So they could work well with our DIY Projectors.

I think I mentioned this before but nobody has tried it AFAIK.

Cheers

Croma, Thanks for those!
Thats what Im talkin about. Easy, future tweakable but immediately effective. But best of all I dont need an airline ticket to go to my nearest Home Depot
I think the important thing here is to use the absolute "minimum" matte film necessary to treat hotspotting. This allows for the brightest image since less light is being eaten. Something tells me 2mm acrylic mirror is too thick too for a sharp image in corners? Might play with some cheap reflective film first....

No worries......yes trying samples is cheaper and no risk.....try before you spend big..
you can then find what your happy with...good luck with it.!

thats weird, i was just experimenting with that etch vinyl yesterday. i put some on a peice of leftover xl10 and it has a good projection with great contrast in ambient light all by itself with nothing behind it. the really cool thing is that because i used clear plastic i could see the image from both sides. like a rear projection. if you had a big enough room you could make a screen that is veiwable from both sides. maybe not practicle but really futuristic and cool.

Boomer: do they only make one type of Parkland plastic or are there several variations/models?