What is this haze?
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Old 04-22-2010   #1
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Default What is this haze?

For lack of a better term. If you look at the edge of the branch and the squirrel, theres like a haze or halo along their edges. This is a 100% crop of this section. Sun was behind me, but mostly blocked by this tree area.

Is this something caused by the camera or lens, or just a digital image at 100%?

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Old 04-22-2010   #2
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Default Re: What is this haze?

That's 'purple fringing', a.k.a. chromatic aberration, or 'c.a.'. An optical shortcoming of the lens system that becomes apparent at certain angles to, and levels of the available light.
Foliage against a bright sky is notorious for bringing it out.
Better lenses have less of it, obviously. But the trade-off is, just as obviously: price.

Wikipedia: Chromatic aberration.
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Old 04-22-2010   #3
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Default Re: What is this haze?

I was wondering/afraid that thats what it was
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Old 04-22-2010   #4
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Default Re: What is this haze?

Douglas, what lens were you using? My understanding is that many of the mid- & upper-end Nikon bodies have built-in CA reduction designed in them for many of the Nikon lenses.

I have gone back and found evidence of CA in images from my Tamron (28-300), but have found none in images from Nikon, Sigma or Tokina lenses, but I'm still looking.

Just curious what you used.

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Old 04-22-2010   #5
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Default Re: What is this haze?

In most cases it is easily corrected (in raw file processing) in ACR.
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Old 04-22-2010   #6
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Default Re: What is this haze?

What camera did you use? The D300 corrects for c.a. automatically.

If I recall there is a way to fix it in photoshop
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Old 04-22-2010   #7
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Default Re: What is this haze?

D90 with the tamron 17-50 2.8
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Old 04-22-2010   #8
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Default Re: What is this haze?

I believe the D90 will also correct for CA, but only with Nikon lenses. The CA is caused by the different channels of light passing thru the elements and not aligning at exactly the same spot on the sensor. Nikon apparently compensates for the "misalignment" with Nikon lenses, but you probably don't get the same feature with non-Nikon lenses.

You can correct most of it in Adobe Camera Raw and in Photoshop CS/Elements.

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Old 04-22-2010   #9
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Default Re: What is this haze?

How do you do that in adobe raw? I have version 4.6 with cs3.

And it figures nikon does this to make sure you use their lenses which cost 2-3x as much
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Old 04-22-2010   #10
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Default Re: What is this haze?

Not sure about 4.6, but in current version (5.7) it is under the "Lens Correction" icon in the adjustment panel. There are two sliders, one for purple and one for Red/Cyan and one for Blue/Yellow.

In CS the same adjustments are under Filter>Distort>Lens Correction...

Also in CS4 I sometimes use a hue/saturation adjustment layer, and adjust the appropriate channel(s) to decrease anything left behind.

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