View Single Post
  #3  
Old 14th February 2009, 11:52 AM
Dave miller Dave miller is offline
Friend
 
Join Date: Aug 2008
Posts: 6,322
Default

Quote:
Originally Posted by percepts View Post
the bellows extension and focal length each have to be squared before the division
Thanks Rob,
I should have realised that because that's the same formula that I use for print enlargement size changes based on the inverse square law.

So for my example it will be 450x450/300/300 = 2.25.
So 3 seconds meter reading will become 7 in exposure time.
__________________
Regards
Dave
www.davids.org.uk
Reply With Quote