I think you have it right. Dead right! Reply from Chris http://www.myimages.chrisspages.co.uk :> -----Original Message----- :> From: owner-photoforum@xxxxxxxxxxxxxxxxxx [mailto:owner- :> photoforum@xxxxxxxxxxxxxxxxxx] On Behalf Of ADavidhazy :> Sent: 03 October 2008 04:35 :> To: List for Photo/Imaging Educators - Professionals - Students :> Subject: That digital camera and weird prop artifact update :> :> Hi, :> :> It was a quiet day here in Rochester, NY, USA and I was a bit bored so :> I decided to simulate what goes on between the scanning action of the :> sensor of the digital camera installed in the phone and the rotating :> image of the airplane's propeller. Not having either a camera-phone :> or an aircraft I resorted to my flat-bed scanner and a makeshift prop :> made of the clear plastic protective disc that comes with a stack of :> CDs or DVDs with masking tape "blades" stuck to the disc. :> :> This is a "no words" status report ... maybe YOU can put words to it? :> :> http://people.rit.edu/andpph/a-misc/2008-propeller-demo-7462AA.jpg :> :> And this is the conclusion that I draw from the above improvised :> experimental set-up. :> :> http://people.rit.edu/andpph/a-misc/2008-propeller-demo-2AA.jpg :> :> ... but I am open to alternative explanations! I may have it backwards :> and reversed left to right or top to bottom, etc. ... ;) :> :> cheerio, :> andy
