Vignetting or light fall-off

To simply state whatメs vignetting, you will need to see the corners of your images after you have taken them, straight out of the camera and with no post-processing and no vignetting correction applied. Vignetting is the darkened corners of the image. This happens because light does not reach the corners of the frame as much as it does at the center. To understand this you need to realize that the lens barrel is cylindrical in shape and the sensor is rectangular. It is a classic case of a square peg in a round hole. Smaller crop sensor powered DSLRs donメt suffer from lens vignetting (or light fall-off as it is also known as) as much as larger full-frame sensor powered DSLRs do, provided the lens remains the same. This is because these smaller DSLRs only uses the center area of the lens (designed for a full-frame DSLR) which eliminates the impact of vignetting happening at the corners. With a lens designed for the smaller crop sensor DSLRs, like the Nikkor 18-105mm VR some vignetting is noticed. Vignetting can be corrected in-camera using peripheral illumination correction. Alternatively you can correct it in Adobe Photoshop (using Camera RAW) using a few mouse-clicks.

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This entry was posted by Sergey L.