Cross focusing units for larger veiwing fields and collage

Ok, Here's part 2. I've only got about 12' of throw distance from the units to the projection surface. And of course, budget is a issue. I have only seen the collage effect work if the units are relatively focused straight in at a 90º angle from the unit to the projection surface. Is it possible to cross focus the units to make the fields larger and correcting the keystoning (which one has to do when using collage) thus using fewer units to fill in the space?
I understand the percieved brightness of the units will diminish from one side of the projection field to the other. My question is will collage work in this scenario?
I am assuming that it would as long as I tell which unit goes where in the collage set-up window. Any takers for answering this "riddle me this?"
Thanks
Jay
JGLD, Inc

0 rkhckp - Former HES Forum Member over 17 years ago

i did my event last month with using the collage. i was for sure not 90 degrees from the projection surface. i used my keystone fixes and had no problem with collage. i did my keystone correction for each projector's throw prior to adding in the collage effect. it seemed easier for me to do it that way, but everyone has their own way of creating something good.

my answer to your riddle
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0 mike hanson - Former HES Forum Member over 17 years ago

There is a limit to how far the cross thought will work. If it is a very hard angle then the keystone just can’t compensate. Also you need to keep in mind that when you use the Collage function you will be using the keystone to make a 3X4 image and this will make the image smaller also. I do not know an exact number, but I would say off the top of my head you can’t go much more then 45 degrees, it might go a little further, but I do not think so. And I think 45 degrees is pushing it.
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0 jgrindrod - Former HES Forum Member over 17 years ago

Ok, thanks for the input. I guess I will have to see if I can squeeze a few more units into the budget to make it work.
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0 z6p6tist6 - Former HES Forum Member over 17 years ago

I am using a pair on my current tour, with each fixture shooting from the side of the stage, at roughly 45 degree angles (PAN) and a small amount of tilt.

I am not 'cross-shotting', but I am definitely pushing the keystoning much farther than I expected it to go, with surprisingly good results.

The fixtures are being edge-blended using the collage generator.

Fixtures are generally set about twenty feet downstage of the ~30-35' wide projection surface, with each about twenty feet off center. I can generally fill the entire width of the backdrop, though not the full height.

Don't know if this helps, but I thought I'd toss in my couple of cents.

PG
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0 jgrindrod - Former HES Forum Member over 17 years ago

Thanks Phil, all input is helpful. My gig is to be televised nationally so I have concerns that if I spread the units out to far I'll lose the brightness I need for
the camera. I'll post later after the show my results.
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