Off-axis parabolic mirrors (OAPs) are often used to bring a collimated beam to focus without aberration. However, an OAP may also be used to form a perfectly collimated beam from a point source (i.e. a source at finite conjugates). Setting up such a system in ZEMAX is fairly simple, but it is important to perform the setup steps in the correct order. A simple example is provided to illustrate this point.