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>ALIGNMENT TO SUBJECT - When composition and camera viewpoint permit, one standard method of maximizing the shallow depth of field at full aperture is to shoot perpendicular to the main axis of the subject. In the case of this mantis, the length of the insect obviously makes this worthwhile.
I don't understand this. If the DoF if like a 3D ''box'' of sharpness through the whole frame that start at an X distance and end in a Y distance, why does it matter if you shoot parallel or perpendicular to your subject?