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Okay, you might find his posture a bit weird. However, according to an article written by Heie, a commissioned officer trained with rifle marksmanship, this posture may help you with long exposure — not with the stretched arm, though.
Anyway, to read full article of adopting rifle marksmanship for long exposure photography, read the following article: Making the Most of Long Exposure Handhelds
*Yokohama, Kanagawa, Japan