Prismatic color selection

[dave]

I'm not too familiar with this, but from what i understand this is a pre pcaom technique to pick colors out, and is still being used with extreme power lasers, such as the grand Cherokee dam..

Can anyone shed a bit more light on the method?

Dave

[LASER-AD]

Sure, i can see if i can remeber it all. We used to use it in our first laser projectors at AVI. the white beam would first his a prism( just the very tip) and the beam would be broken up into its main color lines. Using a Colomating lens, the beams would sit side by side each in a straight line. you could pick off the color you wanted by just inserting a miror at 45 deg and hit a scanner pair with that. Beacuse the beam coming from the prism hit a miror on a scanner, you could move and blend the colors or even modulate the colors so fast as to blend and color modulate the images..It was a beautiful way to add color modualtion to analog imagery... By adjusting frequency and gain you could have pastels or rich primary mixs..... We used 4 scanner pairs and picked off red yellow green and blue. an alignment nightmare, but the most beautiful shows, with lots of Dense imagery... GM20s could handle analog imagery so well, i feel, better than the 6800's i have. It seems you could get denser, higher freq imagery out of them, but for graphics, 6800's won out... we did a lot of tests at AVI on this type of thing, i think we were on of the Last companies to Move from 4 scanner pair shows, but we were still winning a majority of the awards at ILDA conventions.. Funny enough, in both Abstract and Graphic categorys.... God i miss the Old days.......

[liteglow]

yea... I miss that I did not live in that old-days

[yaddatrance]

Most of the old projectors use them. The reason you don't see them much anymore is that you're stuck with the primary laser lines and the difficulty of alignment. I can't find the pictures I have of Gary Statdler's rig, but they followed laserad's description pretty closely, though I do remember a couple of waveplates in there somewhere.



More recently, people use them as their own effects.


There's a GM20 underneath which places the beam through a bounce mirror and the prism and then the scanner.

[steve-o]

Is that duct tape..I mean the great magical repair tape of the world?

[chad]

Is that duct tape..I mean the great magical repair tape of the world? Wink

Close, It is actually Gaff tape or gaffers tape. It is great stuff. It doesn't leave a residue on stuff so it it better than black duct tape.



Chad

That looks like a laserium beam rail.. Is it?

[yaddatrance]

Yeah, that's "gaffer's tape"... if you're running any sort of power, I recommend getting some blackout tape... which is exactly like black tinfoil.

Yep, that's a laserium rail... not anything too special, except it has a machida in the center and a prism scanner on each side. It was built by Craig last year. We also have a classic 600 system which I'm fond of...

[chad]

Cool! Do you have the full system, synth banks and all?

Chad

[yaddatrance]

Yep...


The guts of the 600 is all wirewrapped!


the really cool part is that there were only two authoring boards ever built, and we have the other one!


The projector


A closeup in the crate

In the crate...