ZWO 107mm Quad APO RefractorZWO is well known for their superb astro imaging cameras, but just wait till you get a look at their beautiful 107 mm Quadruplet Apochromatic Refractor! This air spaced Quad refractor uses a 3 + 1 lens structure that contains two pieces of extra low dispersion (ED) glass. This produces a flat field so you do not need a stand alone flattener, which can be expensive! Because there is no need for a flattener, you do not have to worry about calculating
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