Size of image....

[eisenb...@gmail.com]

I have not done much video with QLAB.  I have a theatre cyc and I want to project video of ocean wave using an LCD Projector  Right now the videofills about a third or a half of the back cyc.  I'd like to increase the size of the video to cover most of the wall but I cannot take the projector farther back because that would mess with my lighting.  Is there a way to do this programmatically?

[Sam Kusnetz]

If your projector does not physically project light onto the space you want covered, there’s nothing any software can do, I’m afraid.

Best

Sam

—

Sam Kusnetz (he/him) | Figure 53

s...@figure53.com

On Jan 25, 2023 at 5:59:26 PM, eisenb...@gmail.com <eisenb...@gmail.com> wrote:

I have not done much video with QLAB.  I have a theatre cyc and I want to project video of ocean wave using an LCD Projector  Right now the videofills about a third or a half of the back cyc.  I'd like to increase the size of the video to cover most of the wall but I cannot take the projector farther back because that would mess with my lighting.  Is there a way to do this programmatically?

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[micpool]

Turn all the lights off in your theatre, zoom your projector lens to its widest setting (if it has a zoom lens). You should clearly see the area the projector will cover..  There is obviously nothing you can do programatically to make your image any bigger than this, without rewriting the laws of physics.  However, if  when you connect a computer to the projector, the desktop is displayed smaller than the area the projector is covering, post again with some more details, i.e projector model and how you are connecting the mac to the projector, and someone will be able to suggest  how to make your computer output fill every projector pixel.

[Jake Perrine]

I've often thought a great product to build would be a simple lens adapter that could go over a standard projector lens (maybe clamp onto the projector body like an iPhone add-on lens) that would make a standard projector into a "short throw" projector or vice-versa.  I know not every projector would work with this, but many would.  Maybe something like this already exists?

-Jake

[Egill Ingibergsson]

If you have the space for it this is possible (see image). I sometimes use it to increase ceiling height and direct a beam straight down with an office projector that can not be tilted down. Depends on the size of the mirror how much you gain. Of course a normal back coded mirror will lessen the quality of the video some, but not all that much. I find that functionality most of the time matters more than quality in these matters. Best solution is of cource to find a projector with a wider lens.

[Taichee]

Already exists. 

One of those, Panasonic ET-D75LE95 for the Panasonic projector. This is not a mirror attachment. It’s a type of the replacing lens assembly. 

We can project a 12 meters wide image to the screen from 4 meter distance as theater’s background with a rear projection screen. 

Sorry, I can’t upload the picture of the theater due to the permissions. 

2023年1月26日木曜日 12:39:59 UTC+9 ja...@orcascenter.org:

[micpool]

I think Jake was talking about a cheap add on lens converter for sub $500 boardroom projectors that don't have interchangeable lenses.

Mic

[micpool]

That's not going to double the size of the projected image though is it?

[Taichee]

Make sense. 

Mirror reflection is not new idea. 

I have ever seen such projectors what can project image from the short distance for home use. I forgot but maybe RICOH or Epson since 15 years ago. 

Some “Do it yourself “ guys are doing it in their home. 

This article is a user’s one. 

You can google translate from Japanese language into your language. 

https://584homes.com/life/lifehack/popinaladdin2-mirror-2101.html%20=

He did it with order-made mirror has a special coating for visual quality and dropped safety. His total cost was less than 50 US dollars. A half of the cost is a mirror. He wrote, 100

yen shop ( all 99 cents shop ) mirror was not flat and too small. 

Making an attachment for some

cheap projectors as common usage sounds good. But I don’t know whether it can success as a business.  Stage act needs high power one like this at least Panasonic PT-RZ21K and those projectors can change the lens attachment. ( Expensive though ) because it is necessary. 

2023年1月27日金曜日 0:06:47 UTC+9 micpool: