Firstly, this is my first post on the forum, so please be gentle with me.. I hope this question hasn't been addressed before (I couldn't find it in a search of the forum).. So here goes..
I sometimes use Depth of Field Calculators (I have a couple of apps on my windows phone but I've also used an online one that I've often seen recommended on the forum.. http://www.dofmaster.com/dofjs.html
I've noticed with the phone apps there's a huge difference in the values output for any given focal length/f-stop/focus distance and C of C, so I was trying to find out which is the most accurate.. Then I discovered something a little confusing..
When I switch between the FX CofC and DX CofC (without changing any other values), ALL
the DoF calculators (including the online one linked above) give a LARGER DoF for the FX sensor..
How can that be? As I understand it, DoF is SMALLER
on an FX sensor (0.03 CofC) than it is on a DX sensor (0.02 CofC) for the same focal length/F-stop/Focal Distance?