1. Join Now

    AVForums.com uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

"Gain" of a screen ?

Discussion in 'Projectors, Screens & Video Processors' started by Nick_UK, Jan 12, 2005.

  1. Nick_UK

    Nick_UK
    Banned

    Joined:
    Nov 13, 2004
    Messages:
    9,748
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    103
    Ratings:
    +270
    I have seen people quoting "gains" of screens here - i.e. "this screen has a gain of 1.2:1"

    Can someone explain what this means ? Surely you can't have more light relected back than what has been projected ? :confused:
     
  2. hornydragon

    hornydragon
    Well-known Member

    Joined:
    Dec 19, 2001
    Messages:
    28,293
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    136
    Location:
    Somewhere near the M4 most of the time......
    Ratings:
    +1,215
    no see the stewart screen site they have a good explination.....
     
  3. Cheddies

    Cheddies
    Standard Member

    Joined:
    Jan 11, 2005
    Messages:
    41
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    6
    Ratings:
    +0
    "What is gain and why is it important?
    Gain is the concept of a relative ratio of brightness between a sample and a standard (magnesium carbonate). Gain used to be a very important issue because projectors had low lumen output. The Gain of 2 would be twice as bright as the standard (which looks similar in appearance as a sheet of paper). Since the light is reflecting back to the audience in a front projection screen, the higher the gain is the closer one has to sit directly in front of the screen, whereas if you had a lower gain screen you might be able to sit off axis as far as 40 to 60 degrees and still have a quality image."

    from http://www.diytheatre.com/faq.htm#Anchor_Technical_1
     
  4. Nick_UK

    Nick_UK
    Banned

    Joined:
    Nov 13, 2004
    Messages:
    9,748
    Products Owned:
    0
    Products Wanted:
    0
    Trophy Points:
    103
    Ratings:
    +270
    Thanks everyone :smashin:
     

Share This Page

Loading...