Image Area: Choosing a Movie Crop
You can choose an image area using the [] > [] item in the movie shooting menu. Select [] to shoot movies in what is referred to as “FX-based movie format”, [] to shoot in “DX-based movie format”. The differences between the two are illustrated below.

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The sizes of the areas recorded are approximately 35.9 × 20.2 mm (FX-based movie format) and 23.5 × 13.2 mm (DX-based movie format). Movies shot with a DX-format lens and [] selected for [] > [] in the movie shooting menu are recorded in DX-based movie format.
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Enabling electronic vibration reduction by selecting [] for [] in the movie shooting menu reduces the size of the crop, slightly increasing the apparent focal length.
