;The design is based on the cell phone camera of autofocus . The camera can take pictures from infinity to10 mm (distance of two times focal length). In order to achieve the goal of great depth of field, we requisite the MTF of the object distance from infinity to 10 mm more than 50% in 114 line pair per mm. The object distance for quantity of camera and first order calculation is divided into several parts such as Infinity(for scenery)、1500 mm(for Group Photo)、550mm(selfie)、325 mm(photo A4 document)..etc. As to the object distance from 100 mm to 10mm, the optical quality we want is MTF higher than 40 percent and DPI is greater than 300. For example, we require that when the spatial frequency is 14 lp/mm which means DPI is 711, MTF should greater than 40 percent.
