I caught this elusive lunar feature near 8:00pm on December 9th 2013. I used an iPhone5 attached via a homemade adapter to an 18mm Meade 5000HD eyepiece and 2x Barlow. The “X“ is visible for only 4 hours in the lunar month, so it's not easy to catch it. I used my homemade 6“ f/7.5 Newtonian and a homemade smartphone adapter that works very well.
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