Further info Ian, The scope is unique in that it has an enormous depth of focus ranging from infinity to a spot of tape tacked to the front of the Objective, it will even focus on anything inside the objective lens, in this case the ob lens is out of play and only the reduction lens is doing the focusing, however there is a serious loss of aperture if the focus is on an object less than the focal length of the ob lens away. I fold the optics in three by using two flats, but the flats do not have to be high precision, within one wave is quite adequate, easy to make.
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Re: A new refractor concept
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