Minimum shutter speed + average walking speed

[Yoricko]

Just a very simple topic.

I do not have a digital camera to test this out with, so pardon me.

What is the minimum shutter speed required to achieve acceptable sharpness for a subject that is walking across the frame from 1.5 meters from the camera (8x10" print).

 

[konicaman]

Walking and walking is many things 🙂

Taking a picture of me on my way to work would probably require around 1/4000, on the other hand talking af photo of my wife "walking" when she is out shopping would only require 1/15 😀

In my expericence around 1/250 should do the trick at the given distance, but then again this can be looked at from an almost scientific angle:

http://books.google.dk/books?id=CU7-2ZLGFpYC&pg=PA376&lpg=PA376&dq=shutter+time+walking+person&source=bl&ots=d8CRGFVvhr&sig=EAF1r96cDwfTbnPAh1siWNnlVfs&hl=da&ei=WiNsTdWsMciCOsbe-NUL&sa=X&oi=book_result&ct=result&resnum=2&ved=0CCUQ6AEwAQ#v=onepage&q=shutter%20time%20walking%20person&f=false

 

[Bob Michaels]

The mental arithmetic becomes practical if you can remember that 6 miles / 10 Km per hour approximates 9 feet / 3 meters per second.

Let's say you can accept 1" (approximating 1/10 foot) or 30mm subject movement to cause acceptable blur at your shooting distance, that is a scale down of 1:100 or 1/100th second. Need no more than 1/2" or 15cm subject movement? Then that arithmetic gives you 1/200th per second. Vehicle moving 60 MPH / 100 KPH? You are at 1/1000th second. The arithmetic is not hard is you just keep the decimal in the right place and round the numbers.

Since everyone considers their "location" as either an opportunity to say something funny or a deep secret, the response is both metric and US measurements. Feel free to correct me if I blew the conversions. (Jeez, I hope I did not blow the math)