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i think with a scope like the mewlon you are not ever going to get wide with a binoviewer -purely buy them for lunar/planetary, you won't need the larger prisms.
id be grabbing the binoviewer from matt at telescopes-astronomy in SA -they are an inexpensive but solid unit. as mat suggests you should be able to reach focus, keep in mind the moving of the mirror shifts the focal length of the system a bit longer longer, with a binoviewer in place youll prob be operating at something like 3200mm
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