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Magic Cloth - Stop Loss


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#1 Albion Hockney

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Posted 22 August 2017 - 09:32 AM

Has anyone ever got a reading on how much light is lost with magic cloth. I can't seem to find the information anywhere. 

 


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#2 Edward Lawrence Conley III

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Posted 22 August 2017 - 11:35 AM

The Rag Place has it at 2.5


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#3 Albion Hockney

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Posted 22 August 2017 - 02:05 PM

Can I ask, where did you see that listed?

That is the same as full grid, seems not quiet enough but maybe that is true!
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#4 Stuart Brereton

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Posted 22 August 2017 - 02:40 PM

Diffusion is a difficult one to figure, as it essentially becomes the source, so you can get wildly varying readings depending on meter placement, and where you put the diffusion. For instance, if you take a reading from a lamp, and then put Magic Cloth on the barndoors, it's about a 2.5 stop difference. If you bring the Magic Cloth right up to the meter, it's more like 1.5 stops.


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#5 Albion Hockney

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Posted 22 August 2017 - 02:47 PM

Stuart - are you sure about the above?

That is essentially saying moving a diffusion frame closer and farther from a subject will change the brightness. That doesn't seem correct to me. Or am I misunderstanding what you are saying?
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#6 Stuart Brereton

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Posted 22 August 2017 - 03:00 PM

I have a 650w fresnel right here. It meters f8 at about 4 ft (Don't worry about the meter's settings). With magic cloth held directly in front of the lamp, the meter reads about f3.5. As I move the diffusion away from the lamp, towards the meter, the reading changes to f4.5. This is because the diffusion 'becomes' the source. Try it for yourself. 

 

This effect would become less pronounced with greater distances between lamp and meter/subject, but it's worth bearing in mind if you're lighting with lamps in close proximity to your actors.


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#7 Albion Hockney

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Posted 22 August 2017 - 03:48 PM

wow, thanks for the information.
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#8 Edward Lawrence Conley III

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Posted 22 August 2017 - 04:36 PM

Can I ask, where did you see that listed?

That is the same as full grid, seems not quiet enough but maybe that is true!

 

 

I called them :)


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