Scan thru effect

[Bradfo69]

Hey Dave,

With a fresnel lens such as you have on your projector from SELEM, does the focal length of any of these matter when it comes to using them with a laser?

http://www.edmundoptics.com/optics/o...lated-products

[DZ]

Hey Dave,

With a fresnel lens such as you have on your projector from SELEM, does the focal length of any of these matter when it comes to using them with a laser?

http://www.edmundoptics.com/optics/o...lated-products

I'm not 100% sure. I've tried a number of different fresnel lenses and most of them were terrible, except for the one I got from AVI. If I can figure out the FL of the lens I'll let you know.

[laserist]

Back in the day, we had a scan glass that I'm fairly sure was just cast from a cheap piece of pressed ornamental glass or maybe plastic. For some reason I'm visualizing a yellow square pattern of concentric circles with the outer diameter about 2 inches as the original. For that effect a crappy mold may have actually helped. Craig S. had a reviewer describe it as a yellow stalk of celery...

I'm not 100% sure. I've tried a number of different fresnel lenses and most of them were terrible, except for the one I got from AVI. If I can figure out the FL of the lens I'll let you know.

[Displaser]

was thinking of ordering one of these to try them out

http://www.lenstarlenticular.com/Single/book.htm

Frank,

Nice find. I purchased the sampler that you had mentioned from Lenstar - quick shipping and the price was probably fair considering that they sent eight different sheets. I wanted lenticular plastic to use with a lumia wheel to duplicate effect that we saw from DZ's projector at SELEM. There are a few sheets that will make the effects I was looking for.

As far as scan through effects, I found that all are too wide-angle for what I would deem usable. I'll try to get some video up for the lumia effects in the next day or two.

Greg

[flecom]

looking forward to seeing that

too bad about being too wide, maybe if we can figure out what the different lpi #'s do to the image we can try and source something more appropriate? or maybe its just the way they are made I guess?

I think those are A/B lenticular lenses but I am pretty sure I have seen some that use more than two images, so maybe those are multi-faceted lenses? or something else entirely? not sure, I am really beyond my pay-grade here

[Bradfo69]

Frank,

Nice find. I purchased the sampler that you had mentioned from Lenstar - quick shipping and the price was probably fair considering that they sent eight different sheets. I wanted lenticular plastic to use with a lumia wheel to duplicate effect that we saw from DZ's projector at SELEM. There are a few sheets that will make the effects I was looking for.

As far as scan through effects, I found that all are too wide-angle for what I would deem usable. I'll try to get some video up for the lumia effects in the next day or two.

Greg

I'll be looking forward to that as well. I almost jumped on it and ordered the kit, and still might... but, it will be nice to see pictures of the output first.

[laserist]

cross section.jpgThe top image is a cross section of a fresnel lens (more or less). Visualize what a ordinary lens of that focal length would do (and add artifacts due to the vertical transitions. For laser effects you prob. want a circular pattern similar to the cross section in the bottom image. The nice thing is cutting the top cross section on a lathe requires a lot of precision - cutting the lower cross section is a piece of cake.

Hey Dave,

With a fresnel lens such as you have on your projector from SELEM, does the focal length of any of these matter when it comes to using them with a laser?

http://www.edmundoptics.com/optics/o...lated-products

[dsli_jon]

Heya Sir D -

This is basically just a simple wave scanned thru this effect. Anyone have any clues?

So, just so I can get my dense grey-matter around this (..and for-future homework-Ref.. ) you're saying this optic 'extruded' the simple-sine? Or, are you referring to more of the color-modding / 'shading-like' fx? Lemme know, that-way, when I get a chance to...

Back in the day, we had a scan glass...

..check in 'The Most Holy' at the shop, later-on, I'll understand what the 'target-state' is, and can explain to my new protégé (..my Son, Cal.. and he can sort / test, whilst I werk..

Lemme know, and I'll let ya know..
j