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It's usually a problem that occurs with the lens when it can't bring the wavelengths of color to a focal plane.

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It's when an image has solid blocks of color without detail.

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It's when there are many straight or curvy lines and the camera blends them all together to create an optical allusion.

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When an image gets put into a JPEG format, it condenses the photo and gets rid of 'unnecessary' data. This can result in noise.

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Barrel lens is when subjects in an image seem to be closer to the center while pincushion distortion is when subjects seem to be farther back.

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Auto focus points that you can set so the camera knows where to focus.

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When you take shots of the same image in different settings.

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it shows the exposure of an image.

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Something the camera does internally to adjust to the settings.

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An 18% grey card that you use to adjust the camera's exposure to the scene.