The present paper reports subjective and objective evaluations of a system that provides the experience of hands of different sizes and the allowable visual delay for successful manipulation of objects by hand. The proposed system presents hands of various sizes in an environment that appears to be of constant size by showing a hand and an analogous object through an optical system that adjusts its scaling rate to maintain the object size visually. The experience of hands of different sizes is evaluated subjectively based on answers to a questionnaire concerning recognized hand size. An objective evaluation of this experience is performed by investigating the grasp strategy depending on the hand size and object size. The experimental results showed that the proposed system changes the recognized hand size and grasp strategy appropriately for the presented hand size, and that the allowable visual delay for successful manipulation of objects is 100 [ms].