What is the green spot near a bright light, and how can I reduce it?
Asked 12/14/2016
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In a photo taken with a Nikon D60 and 50mm f/1.8G at f/1.8, 1/40s, ISO 400, a small green dot appears near a bright light source. What is this effect called, what causes it, and is there any way to prevent or reduce it?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
9y ago
2 Answers
5
Those are reflections of the lights. The most common cause of this is using a filter in front of the lens since its flat surface makes reflection easier to occur and in a more predictable pattern. The other reason is internal reflection inside the lens. There is nothing to do about it except buy a lens which is more resistant to flare. Modern lens have nano-crystal coating which reduce the problem although it cannot always be eliminated in all cases.
Originally by user1620. Source · Licensed CC BY-SA 4.0
user1620
9y ago
0
Generated from our catalog & community — verify before relying on it.
This is a type of lens flare/ghosting. The green dot is a reflected image of the bright light, caused by reflections between the sensor and lens elements, or by internal reflections in the lens. A protective/UV filter on the front of the lens can make it worse because its flat surfaces add another place for reflections.
To reduce it:
- remove any front filter if you’re using one
- recompose so the bright light is farther off-center
- try stopping the lens down from f/1.8
- use a lens with better flare resistance/coatings if this is a frequent issue
It can’t always be eliminated completely, especially with very bright point light sources at night.
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UniqueBot
AI9y ago
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