Chromatic aberrations (CAs) manifest as unwanted colour banding, especially around high contrast edges. They occur when a lens bends some colours of light more than others, resulting in disperison. Lenses are designed to minimise CAs.
Aberrations - Irregularities in glass that lead to the incorrect focusing of light, resulting in abnormalities in photography.
Acquire Plug-in - A connection that allows for communication between a digital camera and image editing software.
Lens aberrations Edit
aberrations, explained on homepage of JML
lens triplet in wikipedia
shareware document of Darko Vasiljevic about triplet optimization ...
Aberrations are the blurring and distorting properties of an optical system. A high quality lens will produce a smaller amount of aberrations.
Lens aberrations that make the borders of an image bow slightly inwards to the centre forming a shape like pincushion.
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These aberrations are difficult to spot during a dive because the rear element of an amphibious lens is not visible to the diver. Even with an SLR, the problems might not show up through the viewfinder.
Chromatic aberrations visible at wide angle or maximum apertures
Vignetting at wide angle and maximum aperture
Moderate barrel distortion at wide angle
Rotated CCD (in the camera I had for review) ...
chromatic aberrations
Every lens, to a greater or lesser extent, focuses the light of different wavelengths onto different focal planes and magnifies it differently.
There are 3 aberrations which directly lower the sharpness of an image, Spherical Aberration, Astigmatism and Coma. Some lenses use aspheric elements to better correct spherical aberration at wide apertures.
Chromatic Aberrations, Fringing, & Flare
I did not notice any aberrations or fringing in the 100% crops of the photos that I took, and the photos pointing toward the sun did not have any significant flare. Well done, Panasonic! ...
The Chromatic Aberrations Correction module, which is available for licensing, provides functions which automatically correct aberrations, minimizing the circle of confusion. It is the only available technology for completely automatic CA correction.
Correction of Aberrations at Close Distance Focusing (or CRC):
In general, lenses are designed for maximum performance at infinity. Accordingly, when the lens barrel is fully extended to the shortest focusing distance, resolution is reduced.
Correct chromatic aberrations, vignetting, minor distortion.
Correct anything that was not fully handled in raw conversion.
Color Mode ...
Achromatic Lens An Achromatic lens is a system of lenses joined in order to minimize color and shape distortions (chromatic and spherical aberrations) that are inherent in a single lens system.
aberrations. You may hear photographers talking about aberrations as if they were important. They may make an interesting subject, but knowing all the details about them does not help you to take better photographs.
Generally, the more expensive the lens, the less its aberrations (More attention to optical quality). While no single lens is called a 'perfect lens'. The "ideal" lens would reproduce a subject in a faithful, clearly defined image on film.
Corrector Plate Thin lens-like optical piece which removes certain optical aberrations. Corrosion An unwanted electrochemical process that affects device (e.g., semiconductor, telescope-mounts etc.) reliability.
If you have ever looked through cheap children's binoculars the effect of chromatic aberrations will be all too familiar to you.
This 'purple fringing' can sometimes be found on digital cameras as well.
Q: What are residual spherical aberrations ? This defect is actually a quite evil one. Residual spherical aberrations are focus shifts when stopping down e.g. if the lens has a max. aperture of f/2.
I also tick "Reduce chromatic aberrations" and "Reduce noise".
Next, if you have any objects that were moving between your three shots, you will need to tick "Attempt to reduce ghosting artifacts", "Background movements.
The next step is to fix distortion produced by your camera lens, chromatic aberrations and vignetting problems.
Now you can perform crop and straighten operations to the photos that need this.
Coma One of Seidel's five aberrations. The image of a point source of light is prevented from being brought into focus, but instead appears shaped as a comet or teardrop. Coma can be reduced by stopping down the lens.
(This is called curvilinear distortion.) There are other lens aberrations that make it difficult to keep the entire image in focus at the same time.
Used to reduce aberrations and achieve a more compact lens size. With a spherical lens, rays travelling from the lens periphery create the image before the ideal focal point and give a blurred image centre.
a world with perfect lenses that have no aberrations), a point on the subject would be focused as a perfect point at the plane of the sensor.
Pincushion distortion
Lens aberrations that make the borders of an image bow slightly inwards to the centre forming a shape like pincushion.
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Photoshop CS3 (and CS2), Camera Raw and Lightroom all allow you to correct some color aberrations as well as vignetting caused by the lens. This isn't as refined or sophisticated as DxO Optics, but it does work.
CORRECTION - All lenses have aberrations (defects) to a degree. Minimizing them is known as correction. High-quality lenses have greater correction. The effect of their aberrations is less evident.
When corrective elements are incorporated into a lens design, most spherical aberrations can be minimized. Additionally, these spherical aberrations can often be adjusted with image-editing software. (See also Chromatic Aberration.) ...
The lens does not show any distortion or aberrations. The focus is precise. I recommend this lens, as I have never had any trouble with it. It still is my main workhorse.
Canon EF 70-200mm f/4L USM - Cheapest L wonder ...
One of the common lens aberrations, where straight lines at the edge of the field are caused to bend into the shape of a barrel.
Base leg: ...
Aspherical lens - lens with a curved, non-spherical surface. Used to reduce aberrations and enable a more compact lens size.
Aspherical surface - lens surface with more than one radius of curvature, i.e. the surface does not form part of a sphere.
The drawback is a loss in dynamic range of the image and the dreaded purple fringing (sometimes erroneously referred to as "Chromatic Aberrations") of overexposed portions of the image.
of backlit subjects such as plants, people, and buildings. Chromatic aberrations occur when the camera lens can't focus the different wavelengths of light onto the same spot on the image.
Apochromatic (APO lens)
Lens corrected for chromatic aberrations in all three primary colours. Many manufactures use different names (i.e. NIKON use ED) ...
If the photographer is the proper distance from his subject, he can minimize possible light and chromatic aberrations.
An Aspherical lens surface possesses more than one radius of curvature, which allows for the correction of lens aberrations common in simpler lens designs.
-Barrel distortion - one of the common lens aberrations, where straight lines at the edge of the field are caused to bend into the shape of a barrel.
Lensbaby:
This nifty gadget attaches to your DSLR to produce some creative distortions and aberrations.
Toy cameras and lenses:
Cheap plastic toy film cameras, such as Lomo and Holga, are so much fun to use.
The aspherical elements of a lens help compensate for many lens aberrations common in simpler lens designs. Aspherical elements are particularly important for wide-angle lenses, since they are prone to distortion.
Contemporary lenses are invariably of the compund type. That is, they are made with multiple lens elements, combining to correct image aberrations. This is necessary because light is not single, unified source, but has different color and wavelengths.
Carl Zeiss has introduced the Lightweight Zoom LWZ.2, featuring radically shaped spherical glass, claimed high optical performance and reduced spherical aberrations for distortion-free shooting. Read more
Tags: hd video, lens, Zeiss, hdslr, cine, NAB ...
Each one is individually ground and polished using computer controlled equipment to perform a specific purpose such as focusing the light passing through it in a specific way, or helping to correct any of several different kinds of aberrations ...
Really good optics minimize color fringing, but some fringing is inevitable, especially when corner areas of an image are highly magnified. Some software can automatically 'erase' color aberrations, ...
Flare or lens flare, is a photographic phenomenon in which a light source enters the lens at a specific angle, and causes a pluming effect with the light. It's caused by aberrations in the manufacture of the lens' glass elements.
Flash Extender ...
This prevents the physical length of the lens from changing, or the lens barrel rotating; allows for faster focus, reduces aberrations, and facilitates use of filters that require specific alignment such as polarizers and graduated neutral density.
The end result is a softening of the image, like an old lens with really bad spherical aberrations. Used for allegedly romantic photos of lovers, or for portraits of older people who want to make their wrinkles less obvious.
apochromatic lens
a process lens that has been corrected for both chromatic and spherical aberrations.
Artifacts: Unwanted effects in the image such as blotches (from over-compression), Christmas tree lights (multi-colored speckles from bright highlights), noise (granularity from underexposure) and other aberrations that sometimes afflict digicam ...
A camera lens is actually several lenses combined into one unit. A single converging lens could form a real image on the film, but it would be warped by a number of aberrations.
That’s as far as I go if I plan on working the image in PS. Otherwise I might make curves adjustments, sharpening and noise adjustments. Occasionally I run into vignetting or chromatic aberrations that benefit from the lens adjustment tab but ...
to bend the light back into shape after passing through all of the pieced of glass found in a lens, it has to employ some pretty expensive design strategies and special fluoride coatings and very expensive glass to correct the light aberrations.
defocus is a much greater worry than the diffraction effects caused by very small apertures (and is much harder to correct in software). It'll also eliminate any corner unsharpness, spherical aberration, light fall-off, and chromatic aberrations that ...
Unless it’s blatantly obvious, I don’t comment much about vignetting, chromatic aberrations, coma, and other things that consume some reviewers. The final criterion is does the lens provide the results I desire?
 See also: Aberration, Camera, Image, Lens, Light
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