Albion Hockney Posted January 14, 2015 Share Posted January 14, 2015 For night exteriors i have usually gelled tungsten lights to get them in the ballpark of sodium or other low CRI city lights. I'm curious if light sources which are inherently give a very low color spectrum will be give a broader spectrum if gelled properly for example can I put a little Minus Green and CTB on a sodium light to make the strong color a little more subtle. Link to comment Share on other sites More sharing options...
Premium Member David Mullen ASC Posted January 14, 2015 Premium Member Share Posted January 14, 2015 No, a filter by definition only removes wavelengths, it can't add missing ones. So if you put a magenta gel on a partial spectrum source that only has a few color spikes in the green and orange range, mostly what you do is make it dimmer, it doesn't get less green, there aren't opposite wavelengths that become more prominent as a result. 1 Link to comment Share on other sites More sharing options...
Albion Hockney Posted January 14, 2015 Author Share Posted January 14, 2015 Ok makes sense! thanks much. Link to comment Share on other sites More sharing options...
Dennis Couzin Posted January 23, 2015 Share Posted January 23, 2015 Every cinematographer's kit should include a spectrometer. I used to recommend a Zeiss pocket spectroscope, but hand-held, self-contained spectrometers are now available for just $2000. These instruments show you what's cooking in the suspect "white" light. So you know when two are alike, when filtration might be possible, etc. Link to comment Share on other sites More sharing options...
Stuart Brereton Posted January 23, 2015 Share Posted January 23, 2015 self-contained spectrometers are now available for just $2000. T. Only $2000? Wow, I had no idea they were so cheap... Link to comment Share on other sites More sharing options...
John E Clark Posted January 23, 2015 Share Posted January 23, 2015 (edited) Only $2000? Wow, I had no idea they were so cheap... There's always this sort of solution... One I've been meaning to do when I have some 'spare' time... http://publiclab.org/wiki/desktop-spectrometry-kit-3-0 For those who have middle schoolers in the house, this would be a good science fair project. Edited January 23, 2015 by John E Clark Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now