what causes chromatic aberration

In post processing, Tutorial by Bob Wild

Who Said:
To spot the difference between an average picture and an excellent picture, you have to look at a lot of pictures. And to see an opportunity that others would miss, you have to take a lot of photos that miss the moment, too.

Jim Beecher

Today’s subject is rather a tough, and tricky one if you don’t know about it, or don’t understand this topic, it will either shock you or blow you away. What we are talking about is what causes chromatic aberration. Why? I don’t want you to spend 250 dollars on a print and a couple of years later look at the printing and go “god it’s full of chromatic aberration.”
If you don’t know what chromatic aberration is, take a look at the photo, look closely at the buildings, and leaves. Watch the video to the end. We have a quick tutorial on how to remove chromatic aberration.chromatic aberration
Okay, so what causes chromatic aberration is the very first question we need to ask. For us to understand, we must know what happens when the light goes through a lens. Different wavelengths don’t always focus at the same point, and we’re talking about wavelengths of the various colours of light. Here is where you will notice colour fringing. What is colour fringing? You will see a blue, green or purple fringe around items, so that’s where it’s mainly going to be more noticeable. Like I said, this will blow your mind. Just for fun, go through your images, do you see any fringing?
Yes, this can be conceived as what I like to call pixel-peeping, but it’s better than spending $250 plus on a print or have somebody else come along and point out that you’ve got chromatic aberration. Yup! I’m going to keep plugging this.
More on what causes chromatic aberration, high contrast subjects. So if we’re shooting a portrait of someone and we are using a backlighting technique, and there’s a very light background behind them so you may see colour fringing around their head, especially their hair.
Optics, your lenses can have an effect, and it’s not just the inexpensive, cheaper lens some of the higher lenses will have it as well. All lenses will exhibit some, yes, Lord I said all lenses would.

Let’s look at how we can reduce chromatic aberration in camera.
1) It’s knowing your equipment, both Lars and Bob believe that a lens is for life, camera bodies come and go. So with that in mind purchase the best lens that you can afford.
2) Try to avoid high contrast items; now I know it’s not always possible, Bob loves to shoot into the sun, to capture, that great sun flare. Just beware that doing so may / will cause chromatic aberration.

Watch till the end, where I’ll show you have to remove chromatic aberration in Lightroom and if it too bad how to remove it in Photoshop

wanting more info read the full blog on chromatic aberrations

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