Colin, Interferometry is time consuming to setup, more so then other test methods. Also for conic sections besides spheres, one either needs other "nulling" type optics or image analysis software to compute the wavefront error and show were the problems are. Other tests like double pass autocollimation allow for much quicker testing with excellent accuracy. Once other methods show an excellent figure, then it is time to switch to inferometry to measure the fine details.
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