Vignetting is a darkening of the image toward the corners and edges compared with the center. It comes from the lens design, the aperture, stacked filters or a lens hood, and you can reduce it by stopping down, removing add-ons or using a correction profile in your editor.
The Main Causes
- Optical vignetting happens because the lens barrel blocks some light that enters at an angle. It is strongest at wide apertures and eases as you close the aperture.
- Mechanical vignetting happens when something physical gets in the way, such as a thick filter, stacked filters or a lens hood that is too long for a wide lens.
- Natural vignetting is a light falloff caused by geometry, because light striking the corners travels farther and meets the sensor at a steeper angle. Wide angle lenses show it more.
- Pixel vignetting comes from how the sensor responds to light arriving at an angle, and digital cameras may show a little of it.
How to Spot Which Type You Have
Take a photo of an even surface, like an overcast sky or a white wall, using a wide aperture and look at the corners. Then close the aperture by two or three stops and repeat. If the dark corners fade, it is mostly optical. If they stay sharp edged and curved, you are likely seeing mechanical vignetting from a filter or hood.
How to Reduce It
- Close the aperture a few stops from its widest setting.
- Remove thick or stacked filters, or switch to slim filters made for wide lenses.
- Check that the lens hood matches the lens and the focal length.
- Turn on in-camera peripheral illumination correction if your camera has it.
- Apply a lens profile correction in your raw editor, or use the vignette slider by hand.
Be aware that brightening the corners in editing raises noise there, especially at high ISO.
When Vignetting Helps
Many photographers add a little vignetting on purpose. A soft darkening at the edges draws the eye to the center and adds mood to portraits and landscapes. Keep it subtle, because heavy edits tend to look obvious. Film shooters often enjoy the natural look that older lenses give.
FAQ
Does a full frame lens vignette on a smaller sensor?
Usually much less, because the smaller sensor uses only the central part of the image circle. A lens made for a smaller sensor used on a larger one can show strong dark corners.
Is vignetting a defect?
No. It is a normal trait of nearly every lens, and the amount varies by design.
The Short Version
Vignetting is darker corners caused by lens design, aperture and add-ons. Stop down, check your filters and hood, and use profile correction when you want an even frame, or add a gentle amount for mood.
