Quote:
Originally Posted by percepts
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.