The XA1 used a fixed-focus lens. Although the cameras resembled each other, there were subtle differences in design. The XA3 and XA4 were slightly larger than the XA and XA2. The original XA's dust cover dome resembled a flattened oval, whereas the other models had a more rounded design. Each of these substituted focusing distance for the right-side lever for the aperture-control of the original XA. As a result these cameras were automatic program only, whereas the original XA was an aperture-priority camera.