purple flares on florescent lights?
Posted 24 January 2008 - 09:21 PM
I've noticed that I sometimes get purplish flares intruding into my shot when a florescent light is just outside the frame, just grazing the edge of it. (VARICAM + Canon HJ11x4.7 lens) I'm shooting a doc series in prisons, mostly handheld verite - so no control of lighting. I don't experience the flares if the entire florescent light is in the shot, only when it is grazing the edge.
Any tips on how to deal with that?
Posted 24 January 2008 - 09:28 PM
Posted 25 January 2008 - 04:00 AM
Posted 25 January 2008 - 06:19 AM
Really though, it's just the spectrum of the Kinoflo's light being broken up and altered in the lens coating and various elements. Sometimes I get flares from tungsten sources that appear blue, it happens.
Posted 25 January 2008 - 06:20 AM
Edited by Jonathan Bowerbank, 25 January 2008 - 06:20 AM.
Posted 25 January 2008 - 02:08 PM
I'd guess that coatings probably trump everything else in this case.
It's only with fluorescent fixtures? I was under the impression that the color of flares was mostly dependent on the coating of the various elements in the lens.
Purple is the mixture of red and blue, the far ends of the spectrum. Therefore, we can rule out refraction and diffraction. Flourescents have the infamous green spike, so if anything they'd be deficient in red and blue. That pretty much leaves coatings as the probable cause.
Try testing it with an incandescent source, and let us know what you get.