Angle of diffusion/scrim vs light

A

adaptation

Active member
Just a question for which i cannot seem to find an answer

- DP's nearly always say that diffusion screens and scrims should be parallel to the light - meaning that if the light tilts down 30degrees, so will the diffusion sheet. Can anyone explain what it would do if the diffuser was straight instead of angled?
 
If they are off axis you would get uneven diffusion, dispersion or attenuation of the light. Think of a lens: if it is not parallel to the image sensor part of the image will be sharp other areas will be soft. Does that make sense?

Better yet if you would see the result hold a flashlight to a white piece of paper and change the angle to see how the diffraction changes.
 
Last edited:
Not to mention the fact that it looks dumb.

.

.

.(..all the good scientifically accurate stuff was already said.)
 
Valid points, but there are a number of circumstances where this practice isn't followed, such as keeping a frame out of the camera's FOV, or reducing it's profile to the wind. Also a net's, & to a lesser degree diffusion's, density can be effectively increased by slanting it.
 
Last edited:
You must log in or register to reply here.
Back
Top