I am desperatly looking for some help on this one.
We've got a client whos came to us looking for a solution on his small broadcast tv studio.
They have the interviewing desk on one room, separated by a glass panel, where there are journalists working on the other side of the glass.
The problem is that they are of course seeing the reflections of cameras and personal on the glass since the purpose is to be able to see the journalists working on the background of the broadcast too.
I don't have that much experience with this kind of project so I am looking for help which will be much appreciated.
He says that all he wants is to have a very high lighting level on the journalists side this way the reflection will be eliminated. Well this may be partly true but I think the main issue is their key lights... the ceiling high is not enough to have the key lights higher than the glass panel height so there is a very bright reflection and glare coming straight from these on the glass...
I don't think that exploding light on the other side will help since this is a straight glare on the glass am I right? Also the cameras will have problems with exposure with such strong backlighting, isn't that so?
I've been reading a bit about polarizing filters for cameras and I am inclined to think that this is the solution to be honest. They seem to eliminate exactly this issue. but since they require a manual operation of adjusting the rotation I have no idea if they are ideal to use on a television studio with live broadcast.
To be honest I am lost.
I have attached a few pics which were taken on location. You can observe the reflections clearly on these. (check the reflection of the fluorescent tubes on the top of the glass panel)
Any kind of help would be greatly appreciated.
Thanks in advance!
Dear Diogo, Thanks for reaching out to us and joining the Light Community. For support with your TV studio project, it is best to contact Sergio Binda in Brazil. I will send you an email with his contact details. Sergio, who is based in Brazil, will connect you with the specialist in this field. We have some pretty interesting solutions for studio lighting with LED and I am sure some of the the ColorKinetics solutions will be quite useful. Let us know over here how your project is progressing! Good luck Rogier
Thank you very much for your support Rogier! Much appreciated!
I am familiar with Sergio! He knows my mother because of our distribution company in the Brazilian Northeast which works closely with Philips and we've met sometimes already!
I will take from here in Portuguese with Sergio! Many thanks again!!
I will also keep this post updated with any news!
I've just made some tests with my camera plus a polarizing lens filter.
Of course this wasn't made on location but it proves that some of the reflections are greatly reduced but the direct glare from lighting sources, even if improved, doesn't seem to tottaly disappear.
My main thought is that the issue truly is on the positioning height of the light sources plus the use of these kind of lens.
But then again I am no specialist on the field I have no idea if television cameras can use polarizing filters.
What you guys think?
To be frank, this is a bit out of my area, but....
polarizing filters come in two flavors, circular and linearly polarized. I have no idea which is better for you, but using a polarizer to eliminate reflections of fluorescent lights probably won't work. The light source is too diffuse.
It is easier to eliminate reflections from point sources. You might try experimenting with that next time you are there.
One can purchase anti-reflective glass, a very expensive proposition, and you have the glass already. This works pretty well, but is not perfect and is hard to keep clean.
I think you have a challenge that is best solved by repositioning the lights. I'm not sure if you can put a large sheet linear polarizer in front of the flood (losing half of the light) or the window itself (see below) but that might be possible?
Polarized sheet plastic is available from Edmund Optics (formerly Edmund scientific) or Rosco for experimentation. Small pieces can be used to simulate a polarizer in front of a light source, seeing if rotating THAT filter eliminates the problem. I believe Rosco sells larger polarizers,
Check out this:
or this as potential solutions:
Diogo, I ran across this post and thought I'd offer my 2 cents worth of advice and suggest that the glass be tilted and force the reflection to the ceiling or the floor. The glass is clear and will not cause a problem looking straight through, but the reflection should be bounced away from your line of sight and the camera's and should appear transparent. Yea, this will mean a reinstall of the window and a thicker wall and you probably will have to experiment a bit to get the right angle, but I think that will solve your problem.
It is the relationship (angle) between the light source and the eye that causes you to see the reflection
You might be able to hold a piece of glass up and try different angles by hand just to see if you can make a reflection go away from your test glass. This will not of course impact the glass behind it, but for a few bucks you can test the idea and advise your client how to solve the problem.
Another quick test might be to use a flashlight held at the same height as the current light, and adjust it so that you can see the reflection. Change the angle of the flashlight and it should go away and maybe you will see the light on the floor/ceiling depending on how you move the angle of the flashlight.
Remember the teleprompter uses this trick with a half silvered mirror to let you see through the words being projected in front of the lens.
PS tilting the glass should also eliminate any reflections from shirts, props, etc in the studio as well. Look closely at the 0005 picture and the person's face on the far left has some reflections over it as well.