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The D7100 doesn't allow the lens aperture to be adjusted during video capture.

And remember: always make your exposure compensations by opening the lens aperture.

When using flash, you can often choose your lens aperture through the flash unit.

The amount of light which reaches the film depends on the area of the lens aperture.

This is an easy question for anyone who knows that lens apertures and shutter speeds are reciprocal.

The major lens limitation that affects focusing is the lens aperture.

The darkening can be gradual or abrupt, depending on the lens aperture.

It reeked of oil and fit quite loosely, but she was able to see out of the lens apertures.

The notch tells the camera the lens' maximum aperture.

Since the shot was continuous, it was not possible to adjust the lens aperture as the camera left the room and went into the square.