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Reverse Projection Question

Discussion in 'Multimedia, Projection, and Show Control' started by thorin81, Oct 8, 2007.

  1. thorin81

    thorin81 Active Member

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    I am getting ready to do a show that needs some projections to come up on the cyc that is about mid-stage. My problem is that I don't have the foggiest idea how to set up the projections to rear project since they will be living behind the cyc. Anyone have any suggestions?

    Thanks!!
     
    Last edited: Oct 8, 2007
  2. Footer

    Footer Senior Team Senior Team Premium Member

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    Its pretty simple, most projectors have a few different settings, rear projection, underhung, etc... switch the projector to rear projection and you are set. Every projector I have came across has these settings.
     
  3. jonhirsh

    jonhirsh Active Member

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    Are you asking how to physicaly set up the projector?
    or what settings to use?
    I have included a drawing of a projector set up for rear projection. It is set up on a standard scaffold at the center of the screen.
    JH
     
    Last edited: Nov 28, 2007
  4. Footer

    Footer Senior Team Senior Team Premium Member

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  5. SerraAva

    SerraAva Active Member

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    Also be aware that a rear projector on the cyc or scrim will have a spot which you can see a 'hot spot'. Depending on what and how you are projecting, you can get rid of it by actually blocking the 'hot spot' with a piece of wood. Just have someone stand in front of the cyc and say when they can't see it anymore. This however might lower intensity and possibly block images. Also depends on how bright projector is too.

    Is front just not an option? When I was orginally planning for Ragtime, we were going to do 2 rear projectors with .8 lenses. Instead, we ended up doing front with one, more powerful projector. Also gave us more stage space which the director kept whining about.
     
  6. kwotipka

    kwotipka Active Member

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    If you can put the projector at the bottom of the screen and then correct the keystone, that will get rid of most of the hotspot. Most of the new projectors now have really easy keystone features. Try not to rely on them too heavy though because it will degrade the image a bit.

    kw
     
  7. SerraAva

    SerraAva Active Member

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    Lol, I was going to suggest really high if the projector had enough keystone. But it all depends on a number of things. So if you have the projector, try it out in a bunch of different ways and see what works best. If not, make sure you can play with it for a little bit to get it set up properly.
     
  8. museav

    museav CBMod CB Mods Departed Member

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    The positioning depends greatly upon the lens and the relationship to the audience, as well as practical considerations such as how you can mount the projector.

    Most very short throw lenses (<1.0:1) rarely have any keystone correction capability and defeat any lens shift functionality, thus almost always requiring that the projector be on the centerline of the image with those lenses. Most other lenses will have the projector ideally located near the top or bottom of the image.

    If your audience area is sloped up away from the screen then consider putting the projector towards the bottom of the screen. If the audience area is flat or below the screen, then having the projector towards the top of the image may work better. However, the projector location is often dictated more by practical considerations than it is by technical ideals.

    Somewhere in the projector's on-screen menus is probably a projector configuration option. Typical selections would be front projection tabletop, front projection ceiling, rear projection tabletop and rear projection ceiling. If you can't find this and don't have the projector manual, you can usually find manuals somewhere on the manufacturer's web site, typically either with the product data or under technical support.
     
  9. kwotipka

    kwotipka Active Member

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    Ever had one of those times when your advice comes screaming back at you?

    I must have missed the previous post. What they said.

    kw
     
  10. PhantomD

    PhantomD

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