The flip-up one clips on, too, at least mine does. But the flipping is no real advantage. It will fall down when you least expect it to, and being flipped up inhibits rather than enhancing access to the shutter controls. But it unclips very easily. The Sinar quickie shade is easier--there is only the one post down low, and it does not impede access to the shutter controls from the sides and top.
Rick "easier than screwing a shade onto the lens" Denney
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