Jump to content


Photo

Several lights through Diffusion Frame


  • Please log in to reply
4 replies to this topic

#1 Felix Wiedemann

Felix Wiedemann
  • Basic Members
  • PipPip
  • 11 posts
  • Cinematographer
  • UK, Germany

Posted 19 September 2009 - 06:11 AM

Sorry for asking a question that I could easily find out by testing, but perhaps someone already has experience with this and I don't have much time to work this out.

So far I have mostly used a sinlge light only to go through diffusion frames. In this particular case I will need more stop than I get out of say a 10K through an 8x8 diffusion frame. A bigger lamp is not an option in this case, but I have access to more 10Ks. So my question is: Will two 10Ks (both filling the 8x8 frame) give me substantially more stop that one 10K, perhaps even comparable to a 20K ? What about 3 or 4 10Ks:-)

Thanks a lot !
  • 0

#2 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 19759 posts
  • Cinematographer
  • Los Angeles

Posted 19 September 2009 - 12:44 PM

Sorry for asking a question that I could easily find out by testing, but perhaps someone already has experience with this and I don't have much time to work this out.

So far I have mostly used a sinlge light only to go through diffusion frames. In this particular case I will need more stop than I get out of say a 10K through an 8x8 diffusion frame. A bigger lamp is not an option in this case, but I have access to more 10Ks. So my question is: Will two 10Ks (both filling the 8x8 frame) give me substantially more stop that one 10K, perhaps even comparable to a 20K ? What about 3 or 4 10Ks:-)

Thanks a lot !


Sure it will give you more light - it's done all the time (especially with a long diffusion frame, like a 4'x8'), adding more lights behind a large diffusion frame. The only thing is that it helps to use a thick enough diffusion so that the two lights blend into one that fills the frame, not two slightly softened sources side by side creating two shadows.
  • 0

#3 boy yniguez

boy yniguez
  • Basic Members
  • PipPip
  • 92 posts
  • Cinematographer

Posted 21 September 2009 - 10:04 AM

Sorry for asking a question that I could easily find out by testing, but perhaps someone already has experience with this and I don't have much time to work this out.

So far I have mostly used a sinlge light only to go through diffusion frames. In this particular case I will need more stop than I get out of say a 10K through an 8x8 diffusion frame. A bigger lamp is not an option in this case, but I have access to more 10Ks. So my question is: Will two 10Ks (both filling the 8x8 frame) give me substantially more stop that one 10K, perhaps even comparable to a 20K ? What about 3 or 4 10Ks:-)

Thanks a lot !

yep, every doubling of the light adds one stop - one to two, two to four, four to eight and so forth.
  • 0

#4 Felix Wiedemann

Felix Wiedemann
  • Basic Members
  • PipPip
  • 11 posts
  • Cinematographer
  • UK, Germany

Posted 06 October 2009 - 03:16 PM

Thanks a lot for your help !
  • 0

#5 Chris Millar

Chris Millar
  • Basic Members
  • PipPipPipPip
  • 1642 posts
  • Other

Posted 06 October 2009 - 09:18 PM

yep, every doubling of the light adds one stop - one to two, two to four, four to eight and so forth.


Mind that this is true with respect to those sources and those sources only - if there is any other lighting (ambient or otherwise) then this equation wont hold true for the light the film eventually receives.

Edited by Chris Millar, 06 October 2009 - 09:19 PM.

  • 0


Ritter Battery

Media Blackout - Custom Cables and AKS

Visual Products

Aerial Filmworks

Tai Audio

Technodolly

Abel Cine

Opal

Broadcast Solutions Inc

Paralinx LLC

CineLab

FJS International, LLC

Metropolis Post

Glidecam

Willys Widgets

Wooden Camera

The Slider

rebotnix Technologies

Gamma Ray Digital Inc

Rig Wheels Passport

CineTape

CineLab

Paralinx LLC

rebotnix Technologies

Media Blackout - Custom Cables and AKS

Opal

Willys Widgets

Aerial Filmworks

Ritter Battery

Metropolis Post

Broadcast Solutions Inc

Visual Products

Wooden Camera

FJS International, LLC

Technodolly

Tai Audio

Abel Cine

Glidecam

Gamma Ray Digital Inc

The Slider

Rig Wheels Passport

CineTape