On Tue, Jan 12, 2010 at 12:08 AM, saidimu apale <saidimu@gmail.com> wrote:
I'm not certain this technique will work: panning with slow shutter speed will leave "motion trails" on the subject (in addition to the fore- and background). In the Afghan-motorcycle image, the subject is perfectly sharp/frozen while the fore- and backgrounds are blurred.
Note that by "slow shutter speed" .. we mean relative to the moving object. For still objects slow shutter speeds are usually anything 1/30 or lower where you typically need a tripod. In panning since you are rapidly moving the camera while taking the picture you set a shutter speed relative to the moving object. For trains and aircraft i use shutter speeds of upto 1/400 / 1/500 which is a fast shutter speed for still objects but slow when compared to a fast moving object. Aperture doesnt really matter here ... you dont have to shoot wide open at the largest aperture. You would use large apertures and slow shutter speeds (1/30 - 1/100) to get the background out of focus for still objects / portraits. In this case the background gets blurred because you are moving the camera while taking the picture ... and the background does not move .... only the subject matter is in motion.