If we're adding good stuff check out the common-path Bath Interferometer. The Interferometry group on Yahoo has a lot of discussions and there's a Wiki on it as well. Relatively easy and cheap to build, the computer decodes closely spaced fringes without any reference elements required. The only limitation seems to be accuracy for very fast aspheres...but what else is new?
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check out the common-path Bath Interferometer. The Interferometry group on Yahoo has a lot of discussions and there's a 
