were you shooting from indoors to the outdoors, when the outdoor temp was cold? I have noticed that when I shoot from my enclosed back porch, the temperature differential causes heat waves to waft out of the slightly open slider. This makes my through-the-scope view intermittently blurry, and at moments it can get pretty bad. Meanwhile, sighting through any closed window of my house doesn't give a great view either, since there are screens in all the windows. When I take it outdoors though, it's crystal clear.
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