Filters, basic questions
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Shawn Philip Nelson
Veteran
I just read this in a lighting book that a single cuts the light in half (one stop) and a double cuts it in half again.
So, and I haven't verified this, I think that means that a 1000w with a single behaves like a 500w and a 1000w with a double behaves like a 250w. But, when I drop in scrims, it doesn't look like it's cutting it by *that* much.
So, and I haven't verified this, I think that means that a 1000w with a single behaves like a 500w and a 1000w with a double behaves like a 250w. But, when I drop in scrims, it doesn't look like it's cutting it by *that* much.
that can't be... serious?
I do NOT believe that a single scrim cuts the output in half... but then again I am in the kindergarten stages of my DP development
I've seen scrims thrown on lights millions of times, though I never stopped to analize light itself... I am not completely in tune with the significance of the "lumens" measure... I know it is supposed to be the ammount of light emmited by a single candle at a certain distance, if I remember correctly
still... 50%?!?!? nah...... I need to find that "Set Lighting Technicials Handbook"
I do NOT believe that a single scrim cuts the output in half... but then again I am in the kindergarten stages of my DP development
I've seen scrims thrown on lights millions of times, though I never stopped to analize light itself... I am not completely in tune with the significance of the "lumens" measure... I know it is supposed to be the ammount of light emmited by a single candle at a certain distance, if I remember correctly
still... 50%?!?!? nah...... I need to find that "Set Lighting Technicials Handbook"
I found it and went to pg.175 where the light manipulation section starts but no specific number... just ways to use the different scrims and nets
BTW, the book mentioned the practice of angling nets to increase their effect so just to clarify my question I mean a net that is perfectly perpendicular to the beam or scrims in the lights...
Hey Shawn, what book are you looking at bro?
BTW, the book mentioned the practice of angling nets to increase their effect so just to clarify my question I mean a net that is perfectly perpendicular to the beam or scrims in the lights...
Hey Shawn, what book are you looking at bro?
bcheong
Well-known member
Yes you can feather the net to change the amount of light it cuts down. Perpendicular it cuts less light. You of course can't do that with wire scrims that are dropped in front of the light.
Ok, I see... well it still sounds like a lit but I can start to believe that a double cuts output in half. I bet Shawn just messed up when posting back for me.
Thanks to both of you!
Let me take this a bit further...
I see how angling the net will effectively make it denser and I understand how light behaves when passing through but what about distance?
When setting up a net further away from the source I would expect the effect to be on the smaller area that would now be affected... but would this also increase the effect of the net? My guess is that it doesn't cut more than the 1/2 or full stops for the single and double scrims... I suppose it still cuts the same amount, though you also need to consider the indirect light from the reflection from other surfaces that may be lit by the rest of the beam.
Also, how do scrims affect soft light?
My guess here is that it the net is placed right up against it then there is no difference unless the net wasn't as big as the source. But if you placed it away from the light then it would only cut the direct light in the same fashion and you would have a considerable bigger amount of indirect light to consider from the significantly wider angle of the light.
This is all very straight forward stuff but I'd rather pass this by you guys just in case I am having some sort of permanent brain-fart about it. It feels kinda dumb to ask this stuff but there might be some cool tips or explanations in your heads that I will only hear if I try to stir these thoughts up a little in your heads. Hopefully some of that knowledge will float my way.
Thanks to both of you!
Let me take this a bit further...
I see how angling the net will effectively make it denser and I understand how light behaves when passing through but what about distance?
When setting up a net further away from the source I would expect the effect to be on the smaller area that would now be affected... but would this also increase the effect of the net? My guess is that it doesn't cut more than the 1/2 or full stops for the single and double scrims... I suppose it still cuts the same amount, though you also need to consider the indirect light from the reflection from other surfaces that may be lit by the rest of the beam.
Also, how do scrims affect soft light?
My guess here is that it the net is placed right up against it then there is no difference unless the net wasn't as big as the source. But if you placed it away from the light then it would only cut the direct light in the same fashion and you would have a considerable bigger amount of indirect light to consider from the significantly wider angle of the light.
This is all very straight forward stuff but I'd rather pass this by you guys just in case I am having some sort of permanent brain-fart about it. It feels kinda dumb to ask this stuff but there might be some cool tips or explanations in your heads that I will only hear if I try to stir these thoughts up a little in your heads. Hopefully some of that knowledge will float my way.