28
votes
Accepted
Do convex lenses make parallel light rays of different wavelength converge to different points?
Do convex lenses make parallel light rays of different wavelength converge to different points?
Yes. The separation of different wavelengths of light is called dispersion. Different wavelengths of ...
- 33.2k
22
votes
Do convex lenses make parallel light rays of different wavelength converge to different points?
Light from a far distance object, like a star, arrive at the lens, as parallel rays. As they transverse the lens, they are forced to change their direction. They bend inward, we call this refraction ...
- 39.4k
14
votes
Accepted
What is the blue halo around objects when using a teleconverter?
The blue halo is often referred to as purple fringing. It is caused by chromatic aberration. According to Wikipedia:
There are two types of chromatic aberration: axial (longitudinal), and ...
- 27k
9
votes
Do convex lenses make parallel light rays of different wavelength converge to different points?
Yes, they do. This is the cause of chromatic aberration. It happens in two ways, actually. Axial chromatic aberration (also known as longitudinal CA) happens because different wavelengths focus at ...
- 143k
7
votes
Is it just me, or do smartphone cameras not have any chromatic aberations at all?
It is likely because chromatic aberrations are easy to fix on a fixed focal length, and fixed focus lens. And whatever remains is hidden by the heavy-handed post-processing that occurs.
- 21.7k
6
votes
Accepted
Why is low chromatic aberration considered important in the digital era?
ideal image - no abberration:
simulated chromatic aberration:
correcting the chromatic aberration by adjusting the RGB channel positions (in a more realistic example this would also involve ...
- 5,069
5
votes
Accepted
Why does this camera generated JPEG look better than the software generated one?
It's important to start with this: in-camera generated JPEGs are also software-generated. They're just generated on a small embedded computer with a lot less processing power than a laptop or desktop ...
- 143k
5
votes
Why does this satellite image of an airplane in motion show red, green, and blue bands with strange artifacts?
Looking at the imagery, it was not provided exclusively by a satellite. I work for the company that built the sensors and cameras for Digital Globe WV3 and WV4 sensors and did sensor, motion ...
- 343
4
votes
Accepted
Is this chromatic aberration?
Prevailing opinion seems to be that purple fringing is caused primarily by axial chromatic aberration.
Chromatic aberration comes in two forms: lateral and axial.
Lateral chromatic aberration is ...
- 19.3k
4
votes
How can I avoid those pink/purple lines in my portrait photos?
As established in comments, it's chromatic aberration, specifically purple fringing which you see mostly at high contrast edges in out of focus areas.
You can mitigate it by closing down the aperture ...
- 23.4k
4
votes
Accepted
Is this just chromatic aberration? Or is something else happening in these photos?
The primary reason both images look blurry is because in both of them the point of sharpest focus is closer than most of the scene. Shooting with a wide open aperture minimizes depth of field, so ...
- 176k
3
votes
How to prevent fringing?
You can't, really, unless you want to change to a better lens (they'll have that too, to some amount, but probably less obvious). Super zoom lenses like the 16-300 do always have various optical ...
- 7,181
3
votes
Accepted
Vertical chromatic aberration, fixable?
Each layer of the stack shows the same effect, lessening as that area gets closer to focus. Had I done 2 or 3 more layers to get the entire thing in focus, as I normally do, it would have disappeared; ...
- 176k
2
votes
Is there an easy way to force chromatic aberration?
Find a handful of $10 yard sale grade teleconverters, preferrably designs with as few elements as possible (something like an Anker Duotelematic, NOT something like a Kenko MC7! Avoid single coated/...
- 7,232
2
votes
Vertical chromatic aberration, fixable?
It's probably not diffraction. One of the problems I and others run into with focus stacking is that (depending on the lens) magnification can vary slightly depending on focus distance. This is ...
- 6,774
2
votes
What is the blue halo around objects when using a teleconverter?
As you know, the job of the lens is to project an image of the outside world onto the surface of the camera’s image senor (or film). As the light waves from the vista traverse the glass lens, the ...
- 39.4k
2
votes
Accepted
Is it possible to get green and red chromatic aberration?
Now the usual chromatic aberration patterns are purple/green and red/cyan but is green and red possible through simply shooting the photo?
What photo? The video linked in the question is computer ...
- 176k
2
votes
How can I avoid those pink/purple lines in my portrait photos?
The camera lens projects an image of the outside world onto the surface of the camera’s image sensor. During the exposure, this image is recorded. Mostly these images are tiny however image size is ...
- 39.4k
2
votes
Accepted
What does Canon digital lens optimizer (DLO) do exactly?
Does it use just some generic manufacturing info or can it take into account some programmed calibration data stored in the lens, as predicted by Roger Cicala in “This Lens Is Soft” and Other Facts?
...
- 176k
2
votes
Accepted
Optically reduce chromatic aberration - is it worth trying?
In short, it is not possible.
I swapped out the lens to an APO macro lens, and now I have a clean CA free image.
- 131
2
votes
Do chromatic aberrations change with distance?
There are two different variables in play here: focusing distance and object distance. Chromatic aberration correction is with some priority employed to stop colored fringes to appear when focusing ...
- 936
2
votes
What is the technical explanation of this satellite photography of an airplane moving fast
The second airplane though is myterious to me. It is darker and surprinsingly sharp
This image has almost certainly been pansharpened. The process of pansharpening combines intensity taken from a ...
- 193
1
vote
Accepted
Is it just me, or do smartphone cameras not have any chromatic aberations at all?
A factor which might affect it: the diffraction is so huge on these tiny sensors and the cheap lenses may not be sharp, so it might be the case the image is not sharp enough for you to see the ...
- 6,845
1
vote
Does chromatic aberration affect BW images?
A camera lens, uncorrected, displays each color coming to a focus at different distances from the lens. This was not a big problem for early films, they were sensitive only to violet and blue. These ...
- 39.4k
1
vote
Is it possible to get green and red chromatic aberration?
Some scenes in the computer-generated video may be intended to be viewed with anaglyph 3D glasses.
Red-green chromatic aberration is not normally possible because green is in the "middle" of the ...
- 27k
1
vote
Why is low chromatic aberration considered important in the digital era?
If instead of the three (RGB) sensors in each pixel you had (say) 100 sensors, each sensitive to a range of wavelengths of 1/100 of the visible spectrum, then you would have enough data to correct ...
- 111
1
vote
Why is low chromatic aberration considered important in the digital era?
There are a lot of things, including chromatic aberration, white balance, color temperature, barrel/pincusion distortion, coma, ....... that can be corrected in software. But it's still, and will ...
- 5,158
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