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You might still get some, but they won't be as bright. The longer the exposure, the brighter/larger the diffraction spikes get.
I've even used the technique on my digicam, when taking long-exposure (7s or more) on a street scene for example, I held two pieces of flat grass in a cross pattern across the front of my camera lens, and out came a nice "star cross filter" effect on the bright street lights.
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