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I have a bino viewer and really like it when I'm in the pure visual. Indeed it had the "not enough inward focus" problem and requires a 1.6X lens threaded in to the end to correct for this on both refractors and Newtonians. A Cassegrain doesn't need it. They take a bit of getting used to especially when observing the planets. One needs to correctly focus for both eyes (naturally) and get the eye spacing just right so that you don't see double vision. Very good for the Moon and deep sky especially with long eyerelief eyepieces.
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