Felix Wiedemann Posted September 19, 2009 Share Posted September 19, 2009 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 ! Quote Link to comment Share on other sites More sharing options...
Premium Member David Mullen ASC Posted September 19, 2009 Premium Member Share Posted September 19, 2009 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. Quote Link to comment Share on other sites More sharing options...
boy yniguez Posted September 21, 2009 Share Posted September 21, 2009 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. Quote Link to comment Share on other sites More sharing options...
Felix Wiedemann Posted October 6, 2009 Author Share Posted October 6, 2009 Thanks a lot for your help ! Quote Link to comment Share on other sites More sharing options...
Chris Millar Posted October 7, 2009 Share Posted October 7, 2009 (edited) 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 October 7, 2009 by Chris Millar Quote Link to comment Share on other sites More sharing options...
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