Camera and lens corrections
George Cairns demonstrates how to counteract artefacts produced by your Nikon’s lens
There are a range of artefacts that your Nikon’s lens can add to a photograph. Even the most expensive lenses can produce some geometric distortion. As light is focused through the lens onto your Nikon’s sensor it can cause horizontal and vertical lines to bulge (or barrel) outwards in the captured image, or bulge inwards as pincushion distortion. In general, this geometric distortion is subtle and you’ll only notice it when toggling the correction on and off (as you’ll see in our accompanying video lesson).
Different amounts of light can enter the lens at the edge of the frame, too. This uneven exposure can cause the edges of the photo to become vignetted and appear darker than the rest of the image.
While geometric distortion and vignetting can be subtle, lensinduced artefacts, such as chromatic aberration (colour fringing), may prove to be more unsightly. Fortunately, Capture NX-D can read a photo’s metadata, discover what lens and settings were used and then counteract distortions and colour fringing to create a more accurate representation of the subject.
When shooting a tall subject from a low angle, like our church, you’ll notice the walls appear to converge towards the top of the frame. Capture NX-D can also counteract this perspectival distortion.
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