How to get depth of field on iphone?

Like using iphone camera?

If you do not have control over the lens aperture, there's no way to control depth of field

Second, with such a small sensor, controlling depth of field is going to be very difficult

You already have "depth of field". If you mean SHALLOW depth of field, then you can't do it with such a device. You need a camera with a MUCH larger sensor and a lens in the medium telephoto range with a selectable aperture of 2.8 or less.

Please realize that a phone is not a real camera. It can take some photos as a bonus, but it can never do what a proper camera can do. Also, "apps" are not photography and can't perform actual photographic techniques.

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