Object size appearence at the lateral extreme of an image area

I consider it to be directly addressing the original question, "Object size appearance at the lateral extreme of an image area".

• It refers to the lateral extreme of the image area.
• It affects the size of the object.
• It affects the appearance of the object.
• camera position and focal length are constant
• the surface on which the object is positioned is flat relative to the camera.

edit: to be fair, the object size doesn't change. Only the image size changes.