Colored fringing on images Help Me! I have noticed that when I take images with my Sony A65 and then zoom in (enlarge) them that purple lines display in areas of high contrast such as...

2 Dog Don Loc: Virginia Beach VA

I have noticed that when I take images with my Sony A65 and then zoom in (enlarge) them that purple lines display in areas of high contrast such as the outline of the bird and the outline of some of the sticks . Does anyone know what causes this? or how to prevent it. I have attached an image with this problem.

thanks for any assistance on this issue

The metadata is
focal length 300 MM (70 to 300 MM lens)
shutter 1/500
F5.6
ISO 640

CaptainC Loc: Colorado, south of Denver

It i almost certainly chromatic aberration.
http://www.yourdictionary.com/chromatic-aberration

You will see it in areas as you see here - where very bright areas abut darker areas.

There are some pretty good corrections for it in later versions of Lightroom and Photoshop. It is less prevalent with the expensive lenses, but even there it can show up.

tainkc Loc: Kansas City

Shrink your ISO down a bit and Try for F8 or above. Next time you are in this same lighting condition, take several pics at different settings in order to find that "sweet spot" on your lens. If you have lightroom 4.1 or above, you can also take care of it with one click of the mouse.

Leicaflex Loc: Cymru

CaptainC wrote:

It i almost certainly chromatic aberration.
http://www.yourdictionary.com/chromatic-aberration

You will see it in areas as you see here - where very bright areas abut darker areas.

There are some pretty good corrections for it in later versions of Lightroom and Photoshop. It is less prevalent with the expensive lenses, but even there it can show up.

I agree with Captain C, chromatic aberration and the submitted photograph is overexposed, which contributes to the problem. As stated in this post, lower your ISO, use a small aperture or use exposure compensation.

FilmFanatic Loc: Waikato, New Zealand

Seems like it has quite a glow going on. Using a UV filter perhaps?

oldtool2 Loc: South Jersey

2 Dog Don wrote:

I have noticed that when I take images with my Sony A65 and then zoom in (enlarge) them that purple lines display in areas of high contrast such as the outline of the bird and the outline of some of the sticks . Does anyone know what causes this? or how to prevent it. I have attached an image with this problem.

thanks for any assistance on this issue

The metadata is
focal length 300 MM (70 to 300 MM lens)
shutter 1/500
F5.6
ISO 640

Ae you sharpening this photo? Sometimes if you over sharpen a photo you will get a halo on the edges like this.

Jim D

mdeman Loc: Damascus, Maryland

If you are using PSE try this. First make a new layer and correct the overall lighting exposure. Then reduce the highlights. Now copy that layer to a new layer. Go to adjust Hue/Saturation and switch from Master to individual color. Reduce the saturation completely on Magenta, and a lot on Blue. The add a layer mask and paint back in the areas on the heron where you really wanted the blue.

I find this a lot quicker than trying to do a color replace (at least for those of us that don't have the newer one-click fix tools).

jimmya Loc: Phoenix

2 Dog Don wrote:

I have noticed that when I take images with my Sony A65 and then zoom in (enlarge) them that purple lines display in areas of high contrast such as the outline of the bird and the outline of some of the sticks . Does anyone know what causes this? or how to prevent it. I have attached an image with this problem.

thanks for any assistance on this issue

The metadata is
focal length 300 MM (70 to 300 MM lens)
shutter 1/500
F5.6
ISO 640

This is interesting to me because aberration is a problem I have with one of my lenses, a Tamron 18-200. At 18mm I get aberration, just like yours but if I zoom to say 40mm the problem goes away.

Based on my experience I'd say it's a lens problem and that the widest areas of the lens, at the edges, is perhaps causing the problem. Of course this may not be the case for you at all but I'd say it's most certainly the lens and not the camera.

Good luck

2 Dog Don Loc: Virginia Beach VA

Went into lightroom 4 and used the chromatic aberration repair tool for both magenta and green. This fixed the problem to a large extent. Thanks for the help, now I have to learn to prevent it rather than fix it.

Rob O' Loc: Freakin' Hot Arizona

Chromatic aberration happens because light waves of different frequency (colors) bend differently when they pass through a glass surface. (yes, I'm sure someone will come up with a more scientific explanation) The 70-300mm lens you're using (I'm guessing the SAL70300) is kind of a budget lens and doesn't do a very good job correcting for this. The Captain is right in that more expensive lenses will have less chromatic aberration, because special a-chromatic glass is used in some of the elements. There is a reason they are more expensive. And stopping down your aperture will help to a good degree.

When you're ready to sell a kidney or something, you might consider the G zooms. Virtually no CA and sharper than my dead grandmother's finger nails. (I still remember them digging into my scalp as a little boy when she mussed up my hair.)

tainkc Loc: Kansas City

Rob O' wrote:

Chromatic aberration happens because light waves o... (show quote)

I want him to buy the new 300mm lens so he can post some pictures and see how good it does. Lol.

tainkc Loc: Kansas City

2 Dog Don wrote:

Went into lightroom 4 and used the chromatic aberration repair tool for both magenta and green. This fixed the problem to a large extent. Thanks for the help, now I have to learn to prevent it rather than fix it.

Yes, lightroom saves the day sometimes. Like I said, play with your settings and try not to over expose. After a bit, you will see what I am talking about.