A close-up diopter lens is basically a magnifying glass that screws on as a filter for a camera lens. It shortens the minimum focal distance of the lens, and magnifies the view.
The effect is a great reduction in the depth of field. Here the range of sharp focus is perhaps only 1 or 2mm, compounding the properties of a wide aperture (f/2.5) and the diopter magnification.
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