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4SE in alt az mode; 24 mm Koniq eyepiece; iPhone 7 Plus
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I take a casual look of the Moon with my small astronomical telescope. While I was busy focusing the eyepiece, suddenly an X-mark pops up in front of me. I quickly brap my mobile phone to take photos at the eyepiece, because I have read about the Moon's mark X informally some time ago.
cropped.