Vignetting: Artistic Effect or Lens Flaw?
DefinitionDarkening of the image corners.
1The Simple Explanation
Vignetting is when the edges of the photo are darker than the center. It happens naturally on wide-angle lenses or can be added for 'mood'.
2Technical Deep Dive
Optical vignetting occurs because the lens barrel blocks some light at extreme angles. Mechanical vignetting happens if you stack too many filters on your lens.
Common Misconceptions
Myth: It is always bad. Fact: Portrait photographers add it intentionally to draw the viewer's eye to the center (the subject).