A bit of chromatic aberration

According to Wikipedia, Chromatic Abberation is:

In optics, chromatic aberration (also called achromatism) is the failure of a lens to focus all colors to the same point. It occurs because lenses have a different refractive index for different wavelengths of light (the dispersion of the lens). The refractive index decreases with increasing wavelength.

Chromatic aberration manifests itself as “fringes” of color along boundaries that separate dark and bright parts of the image, because each color in the optical spectrum cannot be focused at a single common point on the optical axis.

It is rare that I notice CA. I guess that it is because it usually only shows in areas of high contrasts. I only noticed it today because I was doing a bit of sharpening and zoomed in to 100%, then it became fairly obvious, as seen in the above picture, which was taken at the airport this morning.

Some weeks ago, Robert Wong asked about my longer term impressions of my Tamron 18-270. I’ve not written more about it because I don’t really have much more to say. I like the lens, though I am about to make a comparison, at some time, between it and my Nikon 80-200mm f/2.8. I don’t really think that it will be a fair comparison. I think that the 80-200mm will pretty much win hands down, though.

Back to CA. It’s not such a big deal anymore because it is quite simple to remove. I simply moved the red/cyan Chromatic Aberration slider to the left to -42 and it all disappeared. Simple as that.