Steep projection angle

[SourceChild]

Hey Peter,

About 6 months ago I created a design proposal to do something you are trying. The installation was for a clients penthouse. The throw distance was about 6' and the screen size was to be 18' tall.

I haver attached a pic showing how we were going to use stacked projectors and bounce mirrors to do this. The mirrors were huge. The blending was not going to work because of the steep angle difference between projectors.

If you look at the pic, you'll see that one projector was below the screen and the other was above. The good news was that we were able to use 1.8 lenses. With 0.8 lenses and better mirrors, it might be possible but nuts.

[Peter]

I haver attached a pic showing how we were going to use stacked projectors and bounce mirrors to do this. The mirrors were huge. The blending was not going to work because of the steep angle difference between projectors.

If you look at the pic, you'll see that one projector was below the screen and the other was above. The good news was that we were able to use 1.8 lenses. With 0.8 lenses and better mirrors, it might be possible but nuts.

We will try to do something like this (also thanks to fons from improve) using a fixed lens 1.2, so there will be only 1 mirror. What do you think? And what the blending in this situation? There will be 3 projectors and 3 foils to cover the backdrop.

[Peter]

Oops, forgot the picture...

[Peter]

Hi guys,

Meanwhile we 've worked on a retro setup. But what do you think about this angle in front? It's a lots less steeper.

Thanks.

[rolfwenzel]

Peter,

I think this might work, nevertheless the calculation of your projection axis should be done with the center beam, not outer beam.
The most important thing in your new Setup is the much smaller Screen and that you can use longer optics than before.

Every Video Guy still would kill you for that, but I would say it will work, did a couple of these angles with Dl2s, 3s and similar

Best

Rolf
www.chaoscenter.net

[Peter]

The most important thing in your new Setup is the much smaller Screen and that you can use longer optics than before.
www.chaoscenter.net

Rolf,

What exactly do you mean by longer optics? 1.2 or 0.8 lens?

I've included a new steeper design. What do you think about that?

Thanks,

Peter

[Peter]

Oepsi, the angle isnt to the center of the screen, didnt sleep enough...

[rolfwenzel]

Peter,

with 0.8 Optics this Setup would never work, as 0.8 needs to be "mostly" on axis.

With 1.2 and beyond the game looks easier as you got much more depth in your focus.

Regarding Distance this looks to me like a classic Zoom Lens like 1.5 - 2.5 or similar. And that's what I have done before with DL2s in this angle, which worked.

[SourceChild]

In a few months I am hopeful to be releasing a lens that will do asymmetrical parabolic distortion. Basically extreme reverse keystoning. The lens theoretically should allow for angles of close to 70 degrees off axis. I am speculating only a 15% light loss.