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Just went out and took this with a cellphone in your honor, OP. Similar tube to yours, a 4" Maksutov. Used a hole saw to cut a hole in a piece of 2x4 then wedged in an old barlow with the glass knocked out of it. It's very rigid. No eyepiece, just directly into the scope and phone is attached with elastic bands. It's 182 of the cleanest video frames (out of an original ~1600) tracked and stacked. I didn't even let the scope cool down and it's pretty cold out tonight, so I lost a lot of frames. I just wanted to get it done before I woke my rooster up.