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There is a version of lens flare you choose, and a version that chooses you. Starburst at f/16 — you stopped down, you knew. Veiling haze across a backlit portrait — that one crept in. Knowing which is which starts with understanding what is actually happening inside the lens when light hits it wrong.
Once you know the cause, the fix becomes obvious. And more importantly, you stop reaching for fixes that do not match the problem.
What Is Actually Happening Inside the Lens
A modern lens is not a single piece of glass. It is a stack of elements — anywhere from six to twenty, depending on the design — each one with two surfaces that light passes through. In ideal conditions, light travels straight through each element and lands cleanly on the sensor.
When a bright light source enters the frame — or sits just outside it — some of that light does not travel cleanly. It hits a glass surface at the wrong angle, bounces off, hits another surface, bounces again, and scatters across the sensor as stray light. That stray light is lens flare.
The specific form it takes depends on where the bounce happens and how many elements are involved. Light scattered across the whole optical stack produces veiling flare — a general haze that lifts shadows and kills contrast. Light bouncing between specific elements produces distinct shapes: the orbs and polygons of ghosting flare, sitting in a straight line opposite the light source.
Anti-reflective coatings on lens elements reduce this significantly. Every glass surface in a modern prime or zoom has a thin coating designed to absorb stray light rather than reflect it. But coatings are not perfect, especially at steep angles or with very bright sources. Older lenses with single-layer coatings — most glass made before the 1970s — ghost and veil freely. That is a large part of why vintage lenses have the character they do.
Why Some Situations Cause More Flare Than Others
Light source angle
The angle between your lens and the light source is the single biggest variable. Light coming from directly behind your subject — at roughly 180 degrees to your shooting direction — is where flare is most likely. As the light source moves further off-axis, flare usually decreases.
This is also why flare behaves differently at different times of day. A midday sun high in the sky at a steep angle to your lens produces different flare characteristics than a late afternoon sun sitting low and directly in your shooting plane. Golden hour is beautiful partly because of the quality of the light — and partly because low sun angles make controlled flare easier to achieve and easier to predict.
Dirty glass and cheap filters
A clean front element scatters less light than a dirty one. Fingerprints, dust, and moisture on the front element act as additional scattering surfaces — they catch stray light and spread it across the frame in ways that have nothing to do with your lens’s optical design.
UV filters add another glass surface in front of every other element. A high-quality multicoated UV filter from a reputable manufacturer adds minimal flare. A cheap filter — thin coatings, low-grade glass — can introduce its own reflections on top of whatever the lens is already producing. Photographers who switch from a cheap UV filter to no filter often see an immediate improvement in contrast, even when flare was not the thing they were trying to fix.
Zoom lenses vs primes
More glass elements means more surfaces for light to bounce between. A zoom lens covering 24–70mm has significantly more elements than a 35mm prime. That is not an argument against zooms — it is context for why a prime often produces cleaner results in high-contrast backlit situations. If you shoot primarily into the light, a fast prime is worth considering for that reason alone.
Mirrorless vs DSLR
Sensor flare — the red or orange dot that appears near the center of the frame — is more common on mirrorless cameras than on DSLRs. The reason is physical: mirrorless cameras have a shorter distance between the rear lens element and the sensor. Light can bounce from the sensor surface back toward the rear element and reflect forward again, landing as a dot rather than a diffuse scatter.
It tends to get worse as you stop down past f/11, and it behaves differently from lens to lens. Some combinations are much worse than others.
How to Reduce Lens Flare While Shooting
Use the right lens hood.
A lens hood works by blocking light that is coming from outside the frame at angles that would cause flare — but only when it is matched to the focal length. A hood designed for a 50mm lens on a 24mm lens does nothing useful at the edges. A generic rubber hood you push onto the filter thread cuts some light but not the right light.
Petal-shaped hoods for zoom lenses are designed to follow the aspect ratio of the sensor — wider at the sides, narrower at the top and bottom. They look odd, but they work. A round hood on a zoom lens is a compromise.
The other issue is position. A hood that has rotated slightly, or one that is dented on one side, may be blocking part of your frame rather than the off-axis light causing the problem. Check it before you assume it is working.
Reframe first
Before adjusting any setting, move. A small change in camera angle — two or three degrees left or right, slightly higher or lower — often moves a bright light source out of the critical zone that is causing flare. This costs nothing and takes two seconds.
Now you have a real choice” — clean lesson-closer, AI punch line pattern. “Serving the image” — same phrase used in Types of Lens Flare blog already.
Remove the UV filter.
If you shoot with a UV filter on all the time — which many photographers do for front-element protection — take it off in backlit situations and compare. The difference is often visible immediately, particularly with veiling flare. A high-quality filter from a manufacturer like B+W or Hoya may make no meaningful difference. A cheap no-name filter almost certainly will.
Aperture and starburst
Starburst flare is created by stopping down, not by the light source angle. If you are at f/16 and seeing sharp rays radiating from a point of light, opening up to f/8 will reduce or eliminate them. This is the one type of flare that aperture directly controls — and it is also the one type that most photographers are creating intentionally.
Understanding how natural and artificial light behaves in different conditions makes these adjustments faster and more intuitive — you start anticipating which type of flare is likely before you raise the camera.
When Avoiding Flare Is the Wrong Call
Veiling flare at golden hour has a warmth to it that is genuinely difficult to recreate in post — not impossible, but the real thing looks different. Ghosting orbs in a concert photograph, a music venue, a street scene at night — whether they work depends entirely on where they land and what else is in the frame. Sometimes they add something. Sometimes they just sit there.
The photographers who handle flare well are not the ones who always eliminate it. They are the ones who recognize what type they are seeing, understand what is generating it, and decide deliberately. That decision — keep it or fix it — is where understanding lens flare stops being a technical exercise and becomes a photographic one.
If the flare is working for the image, the fix was never necessary. If it is fighting the image, now you know where to start. How to use light in photography covers the broader thinking behind light decisions — flare is one part of a larger conversation about what light is doing in your frame and whether you are using it or just reacting to it.
For photographers who want to develop that instinct more systematically, Beyond the Click is where that kind of deliberate seeing gets built.
