The free Magic Sony ViewFinder app presents a precise preview of the camera/lens combination you will be using to shoot your movie. It helps you understand and visualize the effect of different camera/lens settings on the movie you will be making.

It is intended for professional filmmakers and cinematographers, but it is also useful for any amateur who wants to make a movie.

It also has a depth-of-field tool that you can use to calculate the near and far limits of the depth of field.

The app also lets you choose from a number of commonly used color presets (also known as LUTs) to apply to the live picture, which brings you even closer to the final shot.

If the field of view of your real camera is wider than your in-device camera, the app adds "padding" around the image, since the device cannot "see" what is beyond its scope.