Аннотация:The structure of a point image produced by the objective of the GAISh AFR-1 wide-angle astrograph is calculated from design data. The distortion of this objective is also computed. It is shown that the distortion conforms to a simple cube law and that its value is in agreement with that determined from observations. The effect of image structure on the distortion is examined, and the chromatic aberration of magnification is calculated.