Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-18-2009, 05:19 AM   #16
Site Supporter
robbiec's Avatar

Join Date: Feb 2009
Location: Cork, Ireland
Photos: Albums
Posts: 1,220
Original Poster
So I have been doing some more thinking and also calculations:

If I had a 200 DA* and was roughly 500M from where I wanted to focus:
F1 Car @ 200KM/Hour
= 3.33KM/Minute
= 0.056KM/Second
= 56M/Second
or 1 metre in 0.093 a second

My DOF if I set the 200:
to F8 = 20.74M
to F16 = 47.36M

Which leaves me a reaction time all things being perfect of 0.19 Seconds @ F8 or 0.44 Seconds @ F16
Are my calculations correct?

And does that mean I would be better off with a DA*50-135 instead?


Last edited by robbiec; 05-18-2009 at 05:28 AM.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
camera, focus, pentax help, photography, prix
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax K10D Grand Prix campdog Pentax DSLR Discussion 9 11-12-2009 01:24 PM
K10D Grand Prix jct us101 Pentax DSLR Discussion 14 12-12-2008 07:24 AM
Grand Prix Club TheGrandPrixKid Welcomes and Introductions 7 03-01-2008 07:03 AM
Grand Prix of Mosport smcclelland Post Your Photos! 10 08-29-2007 05:11 PM



All times are GMT -7. The time now is 03:52 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top