Well, since I now carry the phone everywhere that I go, I decided that I could write an App that can be used for my pinhole photography. Here are screen prints of the App:
#1
This screen allows me to design a new camera, or load an existing definition.
#2
This screen shows the selection of an existing definition that was previously saved.
#3
Here is the data loaded in.
#4
This screen displays the calculated values of the data loaded into the App.
#5
This is the exposure screen. You enter in the metered values, and calculate the pinhole exposure time.
#6
You can enter in fractions as shown here, or decimal values. This displays the calculated value for the pinhole exposure.
#7
You can add reciprocity to the pinhole exposure. The formula used is for Kodak B&W film.
#8
This shows the built in timer being used to time the exposure.
#9
When the timed exposure is complete, this is what you will see on the screen. You will also hear an alarm.