Green Fringe

S

SplitFieldDiopter

Active member
I've heard many complaints about the fringe caused by over exposing highlights and was just wondering if anyone has had a similar experience with a green tinted fringe. This happened to me yesterday and I'm chalking it up to the same over exposing problems everyone else was talking about.

CINE-D used here, with a 35mm Zeiss Compact Prime. No color correction has been applied. This is a screen shot of the Pro Res transcode.Screen Shot 2011-09-08 at 2.35.07 PM.jpg
 

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Looks to me like your white balance isn't for the light source coming from outside. The only time my camera ever exhibits this color fringing over exposure is when whatever source is being over exposed isn't balanced with my camera's white balance/ color temperature.
 
That makes perfect sense. I'm white balanced for the tungsten bulbs inside the house. I just figured the fringe would be blue. I suppose the green makes sense because of all the shrubs just outside the window....
 
I'm on mobile and can't see the pic at full res but let me say that if you're shooting on a compact prime at absolute full wide open, you may be getting some green (or purple) chromatic aberration in the shot. CP's really shouldn't be used at full wide open if you can avoid it. Stopping down just half a stop can make most of the CA go away.
 
Barry. Don't remember what I was at, but I think it was T4.

Shooter, that's a bummer. I like the looks of windows when they are completely blown out like this (something I often to when shooting film). I guess this is just one of the cons of electronic capture (with a $5,000 camera).

This was just a quick test shot as well. Not TOO concerned about it, especially because it could be avoided with a bit of lighting.
 
You can still completely blow your windows out but you have to keep it in control. ie. Balance the light levels. Assue a lesser dynamic range...especially at the top end.

It was the exactly same with film except digital images just hit the clipper quicker because it is an electronics "limitation"
 
It looks like Chroma aberration... visible in high-contrast areas of frame. It's when all wavelengths of light are not bent equally so you get some fringing. Depending on how it bends (or doesn't bend!) the different wavelengths is the variable color results. Usually it's the violet light bordering ultra-violet, but in this case it looks green. I've seen all colors, even some red fringing, however more rare.

I don't know much about this camera and over powering the sensor, but I do know that this looks like chroma-aberration's menacing work at play.


It could also be the effect of the 'event horizon' of the lighting.

Since the background is so out of focus, maybe the light coming from outside (assuming it's green grass, trees, etc, right?) on the very edge of the curtains is being brought down just slightly and you're getting some of the color from outside exposure? That is a theory.
 
Ryan


That's what I thought it was. I've seen the yellow tinge to the clipping with the AF100, but never green. I chalked it up to the green trees right outside that window. You can tell, it's blue light on the top right corner, and green fringing on the bottom left.


I thought at first it might be a lens aberration, but at T4 I kinda ruled it out. Hopefully it was just the trees....


Appreciate all the theories guys!
 
The upper-right edge of the drapery is strongly suggestive of chromatic aberration since you have the telltale
diffraction pattern of violet->indigo->blue. What's curious to me is what is the source of the diffraction? ...
the glass panes of the window could be the source as easily as the lens elements.

jeff
 
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