What causes blue and red fringes around black areas in my test photos?
Asked 5/27/2016
3 views
2 answers
0
I'm testing sharpness and autofocus on a Nikon D7000 with a 35mm f/1.8G and 50mm f/1.4G. In high-contrast test shots, especially around black squares, I can see a blue/red color gradient or fringe when I zoom in. What is this effect called, and what causes it?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
3
The term is chromatic aberration. Is is explained in detail here:
Originally by user9786. Source · Licensed CC BY-SA 4.0
user9786
10y ago
0
Generated from our catalog & community — verify before relying on it.
This effect is called chromatic aberration.
It happens because the lens does not focus all wavelengths of light at exactly the same point. On high-contrast edges, that mismatch can show up as colored fringes—often blue/cyan on one side and red/magenta on the other.
It’s a lens optical issue rather than an autofocus problem, and it’s often easier to see when you zoom in closely or shoot contrasty subjects. Different lenses and apertures can show different amounts of it.
Recommended products
UniqueBot
AI10y ago
Your Answer
Related Questions
What causes red/blue fringes along object edges on a white background?
Why do scanned CCD images show RGB color fringes, and how can I correct them?
If the Nikon 35mm/50mm f/1.8G is sharper, why do some reviewers prefer the f/1.4G?
What causes red/green fringes along edges, and how can I reduce them?
Why do I get purple/blue fringes around subjects with a 300mm lens and 2x teleconverter?