You photograph a portrait against distant lights, zoom in afterward, and notice something unexpected.
Instead of each out-of-focus highlight looking smooth from the center to the edge, faint circles appear inside it. Some resemble the layers of a sliced onion. Others look like ripples, fingerprints, or tiny rings stacked inside one glowing disc.
The effect is especially noticeable in Christmas lights, city lights, reflections, sunlight sparkling through leaves, or any small bright source thrown strongly out of focus.
Those internal patterns are commonly called onion-ring bokeh.
They usually don’t mean your focus is off, your sensor is dirty, or your lens is damaged. In many cases, the pattern comes from the way a lens is designed and manufactured.
Once you know what to look for, you can quickly identify onion-ring bokeh, understand why some lenses show it more than others, and decide whether to reduce it.
If you want a broader introduction to how lenses render out-of-focus areas, please read What Is Bokeh in Photography.
What Are the Rings Inside Bokeh?
The easiest way to recognize onion-ring bokeh is to ignore the highlight’s outer shape for a moment and look inside.
A smooth bokeh disc may have a fairly even interior. Onion-ring bokeh contains visible concentric bands, ridges, circular texture, or alternating brighter and darker areas within that disc.
Imagine cutting an onion in half and looking at its layers. The similarity is where the name comes from.
The pattern usually becomes easiest to see when:
- The background contains small, bright lights.
- Those lights are significantly out of focus.
- The resulting bokeh discs are large enough to reveal internal detail.
- Strong contrast exists between the highlight and the surrounding background.
- The lens is being used at or near a wide aperture.
Subtle rings can disappear completely in ordinary foliage or a softly blurred wall. Put the same lens in front of nighttime string lights, and its bokeh structure may suddenly become obvious.
That is why photographers sometimes own a lens for years before noticing the effect.
Why Does Onion-Ring Bokeh Happen?
The cause is often connected with aspherical lens elements.
Modern photographic lenses rarely consist of one simple piece of glass. Inside the barrel are multiple elements with different shapes and optical jobs.
An aspherical element has a more complex curved surface than a conventional spherical element. Lens designers use these specialized shapes to control optical problems while balancing sharpness, size, weight, contrast, and overall image quality.
Manufacturing those complex surfaces requires extraordinary precision.
During molding, grinding, polishing, or other production processes, extremely fine circular or spiral surface variations can sometimes remain. They may be far too small to notice by looking through the lens normally.
Defocus a tiny point of light, and the bokeh disc can reveal that structure.
Instead of a smooth interior, the enlarged highlight shows concentric texture.
Importantly, an aspherical element doesn’t automatically mean a lens will produce obvious onion-ring bokeh. Manufacturing methods, optical design, element placement, polishing quality, and the rest of the lens formula all influence the final rendering.
Two lenses can both contain aspherical glass yet produce noticeably different bokeh.
Why Do the Rings Show Up in Some Photographs but Not Others?
Onion-ring bokeh needs the right conditions to reveal itself.
A softly blurred background filled with grass or fabric may contain no obvious individual highlights. Nothing is large or bright enough to reveal the ring pattern.
Point lights behave differently.
Photograph distant decorative lights while focusing on something much closer, and each bulb can expand into a large blur disc. The bigger and cleaner the disc, the easier it is to examine its interior.
High contrast makes the texture even more noticeable.
For example, a pale bokeh circle against a dark nighttime background may reveal far more structure than sunlight filtering through pastel foliage.
Focus distance also matters. Changing your focus point changes the size and appearance of the out-of-focus highlights, which can make subtle rings appear stronger or weaker.
This explains why a lens may look wonderfully smooth during a daytime portrait session yet produce visible rings during an evening photograph filled with lights.
For creative situations where point lights become an important part of the composition, please check out Summer Night Photography Ideas.
Onion-Ring Bokeh Is Different From Cat-Eye Bokeh
These two effects can appear in the same photograph, but they describe different characteristics.
Onion-ring bokeh affects the texture inside an out-of-focus highlight.
Cat-eye bokeh changes the outer shape of highlights, especially toward the edges of the photograph.
One bokeh disc can therefore be oval-shaped at the edge while still containing concentric rings inside.
Separating shape from interior texture makes diagnosis much easier.
The same principle helps distinguish several other effects.
Polygonal bokeh appears when the aperture blades show through a defocused highlight.
Soap-bubble-style bokeh has a pronounced bright outline around the disc’s edge rather than many rings throughout its interior.
Coma distorts point-like subjects near the edges of the photograph into stretched or winged shapes when those subjects are intended to appear as points.
If small nighttime lights look more like tiny comets than circles with texture inside them, please read What Is Coma in Photography.
Does Onion-Ring Bokeh Mean My Lens Is Bad?
No.
A lens is a collection of optical compromises, not a contest to eliminate every possible rendering characteristic.
A model that shows some internal bokeh texture can still deliver excellent sharpness, fast autofocus, strong contrast, low distortion, a compact size, or strong correction of other aberrations.
Whether onion rings matter depends heavily on what you photograph.
Someone making environmental portraits against ordinary outdoor backgrounds may rarely notice them.
A photographer who frequently uses fairy lights, neon, nighttime traffic, illuminated streets, weddings, holiday decorations, or reflected sunlight may see the pattern much more often.
Even then, visibility does not automatically make the photograph unsuccessful.
Study the complete image from a normal viewing distance before judging the lens from a highly magnified crop.
A tiny optical characteristic discovered at 200 percent may be practically invisible in the finished photograph.
How to Test Your Lens for Onion-Ring Bokeh
A simple point-light test can reveal more than photographing a normal scene and hoping the rings appear.
Arrange several small lights in a dark or moderately dim room. Decorative LEDs or fairy lights work well.
Position yourself so there is considerable distance between the focused subject and the lights.
Next, place a simple object closer to the camera and focus accurately on it.
Use your lens near its maximum aperture.
After you take the photo, enlarge one of the largest bokeh discs and inspect the interior.
Look for:
- Concentric circles
- Alternating bright and dark bands
- Ripple-like texture
- Repeating circular patterns
- A fingerprint-like appearance inside the highlight
Now alter the focus distance slightly without changing the lights. Make another photograph.
The discs should change size, giving you another view of the pattern.
Finally, repeat the experiment at a smaller aperture.
This test is different from evaluating how much background blur a lens creates. You are studying the structure of an individual highlight, not simply how soft the background looks.
Will Stopping Down Remove Onion Rings?
Sometimes it makes them less noticeable, but no single aperture removes onion-ring bokeh from every lens.
Closing the aperture changes the light passing through the optical system and usually reduces the size of strongly defocused highlights.
Smaller discs may make internal texture harder to notice.
At the same time, stopping down can introduce another visible characteristic: the shape of the aperture blades.
A nearly circular highlight at a wide aperture might become more polygonal as the diaphragm closes.
Experiment rather than assuming that smaller is automatically better.
Try your lens wide open, then close it by approximately one stop and compare the same background.
If you need help balancing aperture with the amount of blur you want, please check out Best Camera Settings for Bokeh.
Can Cleaning the Lens Get Rid of the Rings?
Usually not when you are seeing true onion-ring bokeh.
Dust, fingerprints, moisture, filters, flare, and dirty lens surfaces can affect image quality in different ways, so it’s always sensible to keep optical surfaces clean.
However, a uniform concentric texture that repeatedly appears inside multiple bokeh discs is more likely part of the lens’s optical rendering than ordinary surface dirt.
If you suspect a protective filter is affecting bright nighttime highlights, try removing it for a quick comparison.
Photograph the same setup again.
If the internal ring structure stays consistent, cleaning or removing a filter is unlikely to change that characteristic.
How to Make Onion-Ring Bokeh Less Noticeable
Buying another lens is rarely the first step.
Start by changing the background.
Large isolated lights against darkness make rings easy to see. A background with softer illumination, mixed color, foliage, reflections, or lower contrast can naturally disguise the internal structure.
Next, experiment with bokeh disc size. Change your focusing distance, subject position, or distance between the subject and background.
Smaller highlights often reveal less internal texture.
Try a slightly different aperture. Even one stop can alter how prominently the rings appear.
Composition offers another solution.
If one exceptionally bright bokeh disc is pulling attention away from the subject, shift your position until that particular light disappears behind the subject or leaves the frame.
The goal is not necessarily to make every highlight technically perfect. The goal is to keep the background from competing with the photograph.
Can You Use Ringed Bokeh Creatively?
Absolutely.
Bokeh does not always need to be perfectly smooth.
Visible structure can work beautifully in photographs intended to feel energetic, unusual, futuristic, dreamy, or abstract.
Neon signs, colorful LEDs, wet pavement, holiday lights, glass reflections, and nighttime traffic can turn textured bokeh into a deliberate visual element.
Instead of hiding the rings, make them larger.
Defocus the light source more strongly and use several colors. Place the bokeh in areas where the photograph needs repetition or visual rhythm.
Another option is to combine textured light with multiple-exposure photography.
Please check out How To Create Multiple Exposure Photography With Light and Bokeh for ideas on using defocused light as a separate visual layer.
For an even wider range of experimental concepts, please read Multiple Exposure Photography Ideas to Try With Your Camera.
A characteristic that feels distracting in one portrait can become the most interesting part of an abstract photograph.
Pay Attention to Bokeh Before Making a Large Print
Subtle background characteristics often look different when a photograph moves from a small screen to a physical print.
A faint texture that disappears on a phone may become more visible in a larger enlargement. Conversely, rings that look obvious when you pixel-peep may become virtually irrelevant when you view the full photograph normally.
Before ordering a print, use the Print Size Converter to compare your pixel dimensions, DPI, inches, and possible print sizes. It is a useful way to determine how large the file can reasonably be printed before committing to an enlargement.
When questions about DPI, JPEG versus TIFF, resizing, sharpening, or print preparation get complicated, Printing Photos Perfectly: File Formats, DPI, and Print Quality offers a practical guide to preparing photographs for home printing or a professional lab.
Judging the photograph at its intended final size is far more useful than obsessing over every optical detail at extreme magnification.
Should You Try to Fix Rings Inside Your Bokeh?
Only when they genuinely interfere with the photograph.
Onion-ring bokeh is one of those optical characteristics you can’t unsee once you learn to recognize it. That doesn’t mean you need to eliminate it from every image.
First, identify what you are actually seeing.
Concentric texture inside the highlight points toward onion-ring bokeh. A changing outer shape suggests another characteristic. Bright outlines, polygonal discs, or stretched point lights require different explanations.
Then judge the effect in context.
Does the viewer notice the subject first, or the bokeh?
Are the rings obvious at a normal viewing size?
Would changing the background, aperture, distance, or composition solve the problem more easily than changing equipment?
Those questions are much more useful than deciding that a lens produces either “good” or “bad” bokeh.
Every lens renders defocused light differently.
Learning to recognize that rendering gives you another creative decision to make before pressing the shutter.
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