by holomaker » Thu Sep 06, 2012 4:55 am
How did you calculate the Lens to produce a sharp image on the ground glass?
No need to calculate, I have many lens for trial and error
What's the space between DMD and ground glass?
About 45 inches
I did some experiments in this direction , too, but always had the problem to produce a sharp image on the glass.
Be sure to use a plano/convex lens with the flat side facing the DMD, and the aperture to cut off out of focus edges
How big is the picture on the screen, and what about incident angle? Do you come normal to the face of the screen?
It’s about 11”x14 “active area and yes normal
Can you describe, or even take a video how the picture on the screen looks like when you view it from the opposite side?
I will work on some photos to show
So in other words, how good does your ground glass diffuse in all directions, and what exactly did you use for your screen
The further the distance between the diffuser and the DMD the better, yes its slightly hotter when viewing normal but this can actually be adjusted to a minimum, the frosted screen was actually made by using a spray on frosted coating on regular glass
How did you calculate the Lens to produce a sharp image on the ground glass?
[color=#FF0000]No need to calculate, I have many lens for trial and error[/color]
What's the space between DMD and ground glass?
[color=#FF0000]About 45 inches[/color]
I did some experiments in this direction , too, but always had the problem to produce a sharp image on the glass.
[color=#FF0000]Be sure to use a plano/convex lens with the flat side facing the DMD, and the aperture to cut off out of focus edges [/color]
How big is the picture on the screen, and what about incident angle? Do you come normal to the face of the screen?
[color=#FF0000]It’s about 11”x14 “active area and yes normal[/color]
Can you describe, or even take a video how the picture on the screen looks like when you view it from the opposite side?
[color=#FF0000]I will work on some photos to show[/color]
So in other words, how good does your ground glass diffuse in all directions, and what exactly did you use for your screen
[color=#FF0000]The further the distance between the diffuser and the DMD the better, yes its slightly hotter when viewing normal but this can actually be adjusted to a minimum, the frosted screen was actually made by using a spray on frosted coating on regular glass[/color]