I've noticed that the when I set diffusion frames to diffuse the sun, they take away way more light then when I put them in front of a light. Is that because of an inverse square thing?
Diffusion Transmission with the Sun vs Lights
Support Cinematography.com and buy gear using our Amazon links!
PANASONIC LUMIX GH5 Body 4K Mirrorless Camera, 20.3 Megapixels, Dual I.S. 2.0, 4K 422 10-bit, Full Size HDMI Out, 3 Inch Touch LCD, DC-GH5KBODY (USA Black)
Posted 16 April 2017 - 02:31 PM
The transmission characteristics of diffusion materials are a constant. They don't change depending on the light being put through them. For instance, LEE 416 has a 50% transmission, so it loses 1 stop of light. This will be the same regardless of whether it is diffusing the sun or a lamp.
Posted 17 April 2017 - 08:06 AM
Posted 17 April 2017 - 04:55 PM
Outdoors at midday, there's literally bounce fill coming from everywhere, even if if our eyes can't normally see it since it's overpowered by direct sunlight. Take that direct source away and suddenly it's a lot more apparent. So you definitely feel the directional change of light more than if you were diffusing from the side.