[Docrwm]

I have two DoF calculators for the iPad - DOF Master and Depth of Field (aka Photographic Depth of Field Calculator).

DoF Master is pretty worthless unless you have a camera that is listed in their preset list - the K cameras are there and it's useful for them, however the Q is not and there is no way to enter the Circle of Confusion as a separate data entry for this calculator. It also allows you to use either meters or feet as the units of measurement, which is nice for those of us in the US.

Depth of Field (aka Photographic Depth of Field Calculator) is much more customizable and does allow the CoC to be entered by the user. Oddly their "SS" category is 0.005mm so it works a treat for the Q (the DoF masters P&S setting is wrong in its calculations and I have to believe because its CoC is wrong but we can't access that to check). The one odd thing about this App is that it is meters only, probably because it was developed in Germany. Given how flexible it is in all other ways (and it has a cleaner interface) I can live with meters as the unit of measurement.

So, if you want an App for the iPad/phone/touch the Depth of Field (aka Photographic Depth of Field Calculator) is a much better choice for Pentaxians because it covers all out cameras natively and is much more flexible for the future.