When [] is selected for [] > [] in the photo shooting menu in mode M, actions such as switching to a lens with a different aperture range may cause unintended changes to aperture. If an option other than [] is selected for [], the camera will adjust shutter speed or ISO sensitivity to maintain exposure at its current value.
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Other cases in which settings may be automatically adjusted to maintain exposure include when:
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lenses with different maximum apertures at minimum and maximum zoom are zoomed in or out, or
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the focus distance changes while a micro lens is attached.
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The setting adjusted to maintain exposure when aperture changes can be chosen from [] and []. Select [] to disable this feature.
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Depending on the lens, the camera may be unable to maintain current exposure at some settings.
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Exposure maintenance is not available during video recording.