Jim,
Yup ... Herschel has a lot of nerve though! Of course if he is chicken
he could use a 1000 mm telephoto lens. ;)
Andy
On Jan 28, 2011, at 4:59 PM, Jim Thyer wrote:
Andy,
Did this calculation on the back of an envelope last night.
At 68 mph a car travels at 100 feet/sec.
According to Wikipedia, typical flash durations 1/1000 to 1/200 sec,
(Much
longer than Chris suggests, but these figures in line with my
recollections
20 years ago), so would get movement
1/1000 sec 1.2 inches movement
1/200 sec 6 inches.
Of course driving a car that fast close to the photographer could
constitute
a traffic hazard.
Jim Thyer
