Focus breathing

Focus breathing is a term that refers to a lens changing field-of-view when changing focus. Most typically this means that the field-of-view widens when focusing towards minimum focusing distance.

Most lenses show some level of focus breathing, unless they have explicitly been designed to not ‘breathe’. However with objective-focusing (all lens elements move together) lenses focus breathing tends to be a relatively minor issue, whereas with many element focusing (used mainly in fixed lens cameras), internal focusing and rear focusing lenses focus breathing sometimes is a major factor.

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