The first can be minimized by stopping down your lens (using a higher f-number), but the second is independent of lens setting. *Technical Note: Internal vignetting is comprised of two sub-categories: optical and natural vignetting. Digital SLR cameras with cropped sensors are also less susceptible to vignetting because the darker edges get cropped out (when using full-frame lenses). It's typically most apparent at lower f-stops, with zoom and wide angle lenses, and when focusing on distant objects. Caused by the inner workings of your particular lens and camera. Appears as a gradual and often subtle darkening away from the image's center. Caused by stacked/large filters, lens hoods or other objects physically blocking light near an image's edges. Appears as a strong, abrupt darkening usually only in the very corners of an image. Often not correctable except by cropping or manual brightening/cloning. Vignetting can be grouped into two general categories: Note how internal vignetting is most objectionable only at the top left and bottom right due to the subject matter, even though the effect applies uniformly to all four corners.
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