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I suggest that you get a 10mm and a 25mm, because 25 will give a wider low power view than a 20, and the barlow will give you effectively four
eyepieces, whereas with a 20 it becomes a 10 which you already have, so you effectively only have three eyepieces. If you like low power sky
sweeping, you could even get a 30mm.
raymo
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