Hotspot gone......

[bindook]

Hi all, i have posted some pictures of my visual setup. the first 2 pics i put up were when i was using a sheet. It showed up the hotspot of the projector nearly 100% & the scenery was a bit blurry. So i tried out a plastic table cover in white & grey. The shots are i have taken were used with the white sheet & straightaway you notice the hotspot gone. All you see is a little orange mark & the scenery is clearer.


Michael

[QF6228]

Those shots look really good mate
Sheet needs a little iron :D

Damien

[bindook]

The reason the sheets are like that is the smallest i could find was 2x 3m & it was folded up. Or i could by a 25m roll for $25.00??? This was a test & if it is ok then i might have to buy the roll. AND DON"T TRY ironing it......... i tried it with a cloth sheet & didn't work :-(


Michael

[Westozy]

I'm interested in this idea as I am using a 230 threadcount sheet too. I don't really have a hot spot because the projector is ceiling mounted 3.5metres away and the cockpit roof keeps it out of view unless you lean forward to see it. Projectors placed on the floor remove the hotspots too. I agree with the "bit blurry" image on the sheet and will try the white plastic. My screen frame is 40mm PVC pipe with 4 elbows glued together in a 16:9 aspect, my sheet has velcro stitched to it at 6" spacing like trampoline springs and there are stick on velcros on the frame. It's easy to stretch it tight and stick on velcro would stick to the white plastic to make an easy refit.
Cheers Bindook,

Gwyn

[NicD]

Looks good Bindook. What distance is your projector from the screen? Is it straight back-projected or are you bouncing off a mirror?

[bindook]

The projector sits in front of the sim which projects onto the mirror back onto the screen, the distance is about 1.5m.

The photo i took was looking into the mirror.

Michael

[Tomlin]

So using a mirror to bounce it back almost eliminates the hotspot since it's at such an angle?

Last night in the old social hall at church, I walked in and the projector was on and luckily the tile floor sizes are 12" tile, and so I counted the space off from the projetor to the screen. It was roughly 18 feet away, and a huge image, perfect for FS. My simulator hangar is 16.5 x 16.5 feet and I think that I should be able to get a good distance to project,depending on how the sim is positioned in the room.

My plan is to eventually use the Triple Head 2 Go and 3 projectors and most likely bounce off of mirrors. I have one that is available to use for testing once I get moved from my home office out back to the hangar, but that's a little while since I have to hang some drywall and buy a a/c unit for this hot weather.

[Bas]

Bindook, could you tell me what projector this is, and the angle of the light hitting the mirror?

Also, what kind of mirror did you use.. just a "regular" one?

My setup is also about 1.5m away, and in my calculations I have difficulty checking if a projector setup is gonna work ok. But since your doing the same I guess it does ;)

[bindook]

Hi Bas,
i'm using a kodak proj, about 5yrs old but works great. the projector sits on a desk in front of the mirror, no angle.

Its a special mirror foil, i get a image of about 2.2m wide.



Michael

[Bas]

Now I am a bit lost..

So its like this?



[1. sim, facing ->] [2. mirror foil] [3. projector facing <-]


...and between 2 and 3 is 1.50m? I assume the mirror is straight up at 90 degrees? The reason I am asking so much is that I have more or less the same setup.. and if I could do it the same way it would be just excellent

Oh btw, so its 220 wide, and how high?

Thanks!

[Westozy]

Hi Bas,
i'm using a kodak proj, about 5yrs old but works great. the projector sits on a desk in front of the mirror, no angle.

Its a special mirror foil, i get a image of about 2.2m wide.



Michael

Good point, when I was using a glass mirror I had visible ghosting in the image. What is the mirror foil stuff Michael? I don't bounce project anymore but it would be good info for everyone.
Gwyn

[Bas]

Can someone please explain to me, how to get an image width that big with only 1.5m ?

I would really like to know, because all the projectors I try on projectorcentral.com with their "Projection Calculator Pro" dont give me those specs.

I have a 1.4m throw distance and I would like to get a 2m image.

[pylet]

I tried something a little radical this weekend. I took the screens out of a 65" DLP big screen TV and cut them down to fit my windscreen... about 42"x32". This totally encloses my cockpit now. I then have my overhead projector hitting a mirror in front of me and reflecting back onto the "new" cockpit windows. Here is a small video YouTube - Testing New Cockpit Wind Screen showing a couple of take offs and landings with the test windscreen. In the video it appears to have a major hot spot but I don't see that from the cockpit. Not sure why the camera picks that up. Also, the stuttering is the recording web cam. You can see that even I stutter in the video as well to prove that it's the cam and not the display frame rate. Biggest bitch is that the display is a little fuzzy out toward the outer edges, not sure why or how to correct.

Anyway, I have not seen anyone trying to make cockpit windows out of old big screen tv screens so I thought I'd try it.

[bindook]

Bas,
the height of the image i get is about 1.5m. the image projected onto the mirror is only about .5mt x .5mt



Michael