The direct pickup of integral imaging typically needs to overcome limitations especially the restricted depth of field (DoF) under a lenslet array. In order to solve the problem, we design a motion parallax enhancing approach for three-dimensional (3-D) integral optical display only relying on a commercial Lytro camera. First, the non-uniform axial compression from the zoom lens of the Lytro camera is analyzed and experimentally investigated. Next, using depth slicing, locating and retargeting, the parallax of the integral optical display is significantly enhanced. Additionally, the displayed depth information can be presented in a uniform compression with the same proportion as the real scene even without the prior knowledge of the actual object distance. The experimental results prove the feasibility of the proposed method, which provides an efficient way for the acquisition of the elemental image array. Additionally, it is also a new attempt to expand the application scope of the Lytro camera from 2-D refocusing to the content acquisition for the integral display.