So, can I use a star diagonal with the Galileoscope?
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Probably not. The Galileoscope is designed for straight-through viewing. There’s not enough “in focus” to permit the use of most star diagonals (we haven’t tested them all, but we haven’t found one yet that works). We recommend sitting in a chair with the Galileoscope on a tripod that can be extended to a height of at least 150 cm (60 inches). That way, observing celestial objects high in the sky will be comfortable even without a star diagonal.