It’s likely that you’ll notice Chromatic Aberration in high contrast areas of your images. I usually find it against a bright sky.

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The result is that objects will have a colorful glow around them. This color fringing can appear to be red, green, blue, yellow, purple, or magenta and sometimes an image will contain CA with a few different colors.

I like to check for it in each image before I begin hand-editing, but you can also create an import preset in Lightroom to easily remove CA upon import.

In this example, the sun was shining through the trees which caused the sky in the top right of the frame to blow out. Here’s a straight out of camera, high contrast image I shot recently on my Nikon D750 with a retro Sigma 28mm mini-wide lens. Inevitably, there was some CA in the image which you’ll notice in the close up of the top right corner.

Just remember to check the other areas of your frame, especially your subjects, to make sure the CA corrections aren’t overdone.

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Now that you have a handle on what Chromatic Aberration is and how to fix it, keep an eye out for it in your images. It’s amazing what a difference it can make in creating a crisp and clear final edit!

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Magnification is the process of enlarging something only in appearance, not in physical size. This enlargement is quantified by a calculated number also called “magnification. ” The term magnification is often confused with the term “resolution,” which describes the ability of an imaging system to show detail in the object that is being imaged. While high magnification without high resolution may make very small microbes visible, it will not allow the observer to distinguishbetween microbes or sub-cellular parts of a microbe. In reality, therefore, microbiologists depend more on resolution, as they want to be able to determine differences between microbes or parts of microbes. However, to be able to distinguish between two objects under a microscope, a viewer must first magnify to a point at which resolution becomes relevant.

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To correct it, I open the image up in the Develop Panel of Lightoom CC and select “Lens Corrections”. Under the “Profile” tab, select “Remove Chromatic Aberration”.

Nov 7, 2018 — Achromatic lenses corrects for color, by bringing in two wavelengths (typically red and blue) into focus. The lack of a flat field of view and ...

Creating a preset of adjustments in the manual tab will not work for every image. It will likely cause grey fringing if the correction is too heavy handed.

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At very high magnifications with transmitted light, point objects are seen as fuzzy discs surrounded by diffraction rings. These are called Airy disks. The resolving power of a microscope is taken as the ability to distinguish between two closely spaced Airy disks (or, in other words, the ability of the microscope to distinctly reveal adjacent structural detail). It is this effect of diffraction that limits a microscope’s ability to resolve fine details. The extent and magnitude of the diffraction patterns are affected by the wavelength of light (λ), the refractive materials used to manufacture the objective lens, and the numerical aperture (NA) of the objective lens. There is therefore a finite limit beyond which it is impossible to resolve separate points in the objective field. This is known as the diffraction limit.

Lightroom will automatically adjust any obvious CA. Sometimes, there are some additional adjustments to make. If this is the case, select the “Manual” tab.

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When your dropper changes color, select that spot on the image. Your Purple Hue and/or Green Hue and Amount sliders will adjust to decrease the CA. You can also adjust the sliders by hand if necessary.

CA will appear in your image along the edges of people and objects. It occurs when a lens fails to capture the wavelengths of color on the same focal plane.

Use the dropper tool to select areas with Purple or Green Chromatic Aberration. When you find a spot, your dropper will turn either Purple or Green depending on which color you’re hovering over.

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If they are, you’ll notice a grey border around the edges. Adjust the Purple Hue and Green Hue sliders manually until you regain the proper color around your subjects. Then, continue editing your image as you normally would.

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Keep it simple by selecting the Lightroom Profile tag adjustment, “Remove Chromatic Aberration”. That way, any minimal fringing will be removed.

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Resolution depends on the distance between two distinguishable radiating points. A microscopic imaging system may have many individual components, including a lens and recording and display components. Each of these contributes to the optical resolution of the system, as will the environment in which the imaging is performed. Real optical systems are complex, and practical difficulties often increase the distance between distinguishable point sources.

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If your dropper hasn’t changed colors, move it around until you find an area with enough purple or green contrast. If Lightroom doesn’t have enough color information in the spot you select, it will prompt you with the following warning: “Cannot set the purple or green fringe color. Please sample a representative fringe color again”.

This page titled 3.1D: Magnification and Resolution is shared under a CC BY-SA 4.0 license and was authored, remixed, and/or curated by Boundless via source content that was edited to the style and standards of the LibreTexts platform.

I agree that places in the photo of high contrast (tree branches against sky) are most vulnerable to CA. Some of my lenses have more of a tendency towards CA than others. One of my oldest lenses (probably 25 years old) is the most CA-free. I agree that until you see CA, you don’t know it is there. But upon close inspection I usually find a little bit in most of my landscape photos.

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