Lens Flare and Ghosting: What They Are and How to Prevent

Understanding flare and ghosting

Lens flare and ghosting are related but distinct optical effects that show up when bright light enters a lens. Flare appears as a soft, veiling haze that washes out contrast and color across part of the image. Ghosting shows up as distinct, often geometric shapes that mirror the light source, sometimes in rainbow colors or as a row of smaller copies.

The difference matters for diagnosis. If the image looks milky or low in contrast even in the shadows, that is flare. If you see overlapping colored circles or hexagonal blobs, that is ghosting. The two often appear together because they share the same root cause: light reflecting inside the lens instead of following a straight path to the sensor.

What causes internal reflections

When a strong light source, such as the sun, a streetlamp, or a bright window, hits the front element, most of the light passes through the glass to the sensor. A small portion, however, reflects off the curved surfaces of each lens element. That reflected light bounces around inside the barrel and eventually reaches the sensor, creating the haze and shapes you see.

The more elements a lens has, the more air-to-glass surfaces exist, and the more chances for internal reflections. Zoom lenses, which often contain a high number of elements, are more prone to flare than simple prime lenses. The same applies when you add a teleconverter or a lens mount adapter: extra glass in the path means extra reflective surfaces.

Flare can also come from light entering the lens at an angle that the aperture blades or the interior barrel walls cannot fully block. Even with a clean front element, a strong side light can scatter internally and produce the veiling effect that lowers contrast across the frame.

• Direct sunlight in or near the frame is the most common trigger.
• Artificial lights at night, such as street lamps or stage lights, cause flare and ghosting too.
• Reflections off water, snow, or glass can create secondary bright sources that enter the lens at odd angles.

Lens coatings and optical design

Lens makers fight internal reflections with anti-reflective coatings applied to each glass surface. These thin layers reduce the percentage of light that bounces back, which is why modern lenses show far less flare than older designs. Canon's technology pages describe optical design as one of its core competency areas, and Sony's Alpha Universe covers the development of its G Master lens line, where coating and element design improve resistance to flare and ghosting.

When you compare lenses, look for the maker's statements about coating technology. A lens with multicoated elements will usually handle strong backlight better than a single-coated design. For a deeper look at how coatings work, read our separate guide on lens coatings and flare control.

Optical design also matters. The shape and position of each element determine where reflected light lands, so two lenses with similar specs can behave very differently against the sun. Even within one line, a newer version often has better flare resistance than the previous generation.

Spotting flare in your photos

Flare is easiest to spot on the camera's rear screen or electronic viewfinder before you press the shutter. Look for a washed-out area in one corner, a loss of contrast around the edges, or a row of small colored dots that follows the shape of the light source. If you compose with the sun just outside the frame, check the edges for a glow that was not there when you pointed the camera away.

On a mirrorless or DSLR in live view, the preview shows exactly what the sensor sees, so you can tilt the camera slightly to see if the flare moves or disappears. This is one reason an electronic viewfinder is handy for flare-prone scenes: you can evaluate the effect before taking the shot.

In post-processing, flare shows up as a subtle loss of shadow detail in one area, while ghosting is obvious as overlapping shapes. If you shoot RAW, you may recover some contrast, but you cannot fully remove a strong veiling flare.

Preventing flare with a lens hood

The simplest and most effective tool is a lens hood. A hood blocks light that comes from outside the image area, stopping it from hitting the front element at a shallow angle. This directly cuts the internal scatter that produces veiling flare. Every lens benefits from a hood; even a compact camera's built-in lens cover can help if it shades the glass.

Hoods come in two common shapes. A round or cylindrical hood works for prime lenses, while a petal or flower hood is shaped to avoid vignetting on zoom lenses at wide angles. If you lost the original hood, a third-party hood that fits the filter thread works as long as it does not block the lens's field of view. See our guide on lens hood types for how to choose the right shape.

When you cannot use a hood, your hand or a hat held just above the lens can shade the front element from direct sun. The goal is always the same: keep stray light out of the barrel.

Composition and light angle

Changing your position can reduce flare more than any accessory. If the sun is just outside the frame, step to the side so a building, tree, or your subject blocks the light entirely. Even moving a few feet can change the angle sharply enough to eliminate the reflections inside the lens.

When you want the sun in the frame, place it behind a small object, such as a branch or a person, so the direct beam is partly blocked. This keeps the bright source from striking the front element straight on, which is the main cause of ghosting.

For artificial light at night, the same logic applies. A streetlamp on the edge of the frame will generate flare; recompose so the lamp sits behind a pole or out of the image, and the effect vanishes.

Filters and glass condition

Every filter you add, such as a UV, polarizer, or neutral density filter, places extra glass surfaces in front of the lens. These surfaces reflect light and can worsen flare, especially when the filter is dirty or coated poorly. If you shoot often in backlit scenes, remove the filter and rely on the lens's own coating.

A dirty front element scatters light strongly. Dust, fingerprints, and smudges all add diffused bright spots to the optical path. Clean the glass gently with a blower and a microfiber cloth, and check the rear element too, because a dirty rear surface can cause a soft glow that is easy to mistake for flare.

Nikon's photography guides cover lens filters and image care in detail, and the same advice applies to any camera system: a clean, uncoated or poorly coated filter is more likely to add artifacts than to protect against them.

When flare is creative

Flare is not always a mistake. Many photographers use a deliberate sun flare to add warmth, atmosphere, or a cinematic feel to a portrait or landscape. The key is to control it rather than let it wash out the whole frame.

To use flare intentionally, compose with the sun at the edge of the frame, use a smaller aperture to make the flare shape cleaner, and expose for the highlights so the subject stays visible. You can also push the flare further in post-processing if you shoot RAW, but it is easier to start with the look you want in camera.

Whatever your approach, a lens with good coating gives you the choice: you can let a little flare in for effect or block it entirely with a hood. Most systems, from a compact to a full-frame mirrorless, give you enough control to do either.

What to pick for your use

Questions

Is lens flare the same as ghosting?

No. Flare is a soft, diffuse haze that reduces contrast, while ghosting appears as sharp, repeated shapes or colored spots that mirror the light source. Both come from internal reflections, but they look different and respond to different fixes.

Will a lens hood stop all flare?

A hood blocks light from outside the image area, which removes the most common cause of veiling flare. It cannot stop flare from a light source that is inside the frame; for that you need to change composition or accept the effect.

Do filters make flare worse?

Usually yes, because every filter adds extra reflective glass surfaces. A clean, high-quality multi-coated filter adds less flare than a dirty or uncoated one, but removing the filter entirely is the best way to minimize reflections in backlit scenes.

Is flare worse in zoom lenses than in prime lenses?

Zooms tend to show more flare because they contain more lens elements and therefore more air-to-glass surfaces where reflections can occur. However, coating technology and optical design matter more than the number of elements, so a well-designed modern zoom can outperform an older prime.

Can lens flare damage the camera sensor?

No. Flare and ghosting are purely optical effects; they do not harm the sensor or any other part of the camera. Extended direct sunlight can overheat some cameras, but a few seconds of flare in a photo is completely safe.

Should I shoot RAW to fix flare in post?

RAW gives you more flexibility to recover contrast and reduce the haze in editing, but it cannot remove strong ghosting or a dense veiling flare. Prevention with a hood and good composition is always more effective than any post-processing fix.