On May 22, 2007, at 1:00 AM, mike wilson wrote: >> Hint: J H Lartigue >> >> http://arts.guardian.co.uk/pictures/image/0,8543,-10404954434,00.html >> >> ...although the wheels aren't oblong. Don't know what kind of >> distortion would do that! > > It's not distortion of the lens type, it's an effect of the focal > plane shutter working in slit mode. As the slit crosses the frame, > the wheel moves forward, giving the oval shape. It's just > fortuitous (or maybe a result of this photo in particular) that the > direction it leans is the one usually depicted graphically to > indicate speed.
In this case the camera was also panning with the car creating even more interesting distortion, like the leaning man on the left. To visualize how it happens, turn the picture upside down and consider a relatively slow moving slit running from top to bottom, and that "straight up and down" would require a vertical line through the man on the left... G -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
