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My post last week about shadowgraphy and Schlieren photography generated a lot of enthusiastic responses and not a few requests for a more detailed tutorial. Among the comments was one by Ian Smith, who has a great page here describing his own Schlieren photography set-up. (While you’re there, take a moment to appreciate the fact that Ian’s URL is “www.ian.org”….think he’s been around the ‘net awhile?) Thanks again, Ian!