My favorite panning shot. Taken at Charlotte last year. I think I set it to continuous/servo AF, increased the exposure time, and set the f-stop low for a shallow depth of field. One significant key to panning (and shooting skeet) is to keep the lens moving l/r or r/l after you shoot... keep tracking the movement.
IMG_9547 by dougkirchberg, on Flickr
Speedycop/NSF Racing /Pinewood Dirtbags
'10 Summit, CMP3, Autobahn, '11 CMP1, NJMP, CMP2, Summit, G'man, Stafford, Charlotte, Autobahn, ECR '12 CMP1, NJMP, G'man, NHMS1, Summit, CMP2, NHMS2, ECR, '13 CMP1, ECR, Summit, NJMP, THill, CMP2, MSR, NHMS, Sears '14 Barber, Sears1, ECR, CMP1, NJMP1, BWillow, Sebring, CMP2, THill, Sears2, '15 Sears1, Barber, Ridge, THill, '16 Sears1