Bulb Exposure Calculator app for iPhone and iPad

= THIS APP IS NOT A LIGHT METER =

* NEW *
At LV mode and at 1/3 step setting, ISO and SHUTTER speed interactive mode is added. This is helpful for digital camera with high ISO setting user to calculate long time exposure. For example, ISO204800 F16 1/8 is equal to ISO100 F16 4min.

This app helps ev calculation for long time photo lover.
For example, for pinhole photo, set f stop to 512 (from your calclation), then choosing ev will show the shutter speed (up to 16h) time. This app is for who want calculate shutter speed more than 30 second.

Also ND Filter calculation (up to density 6.0, 0.1 step) is available. And LV mode (equal to EV mode ISO 100) calculation.

BLUE: EV Calculator (or LV).
GREEN: FIXED ISO and EV interchangeable F and S.
YELLOW: FIXED EV and F interactive ISO and S (LV mode and 1/3 step setting only).
ORANGE: FIXED ISO and F. Calculate S with ND Filter.

you can set
ISO 6 to 204800 (1/3 step)
F 1 to 512 (1, 1/2 or 1/3 step)
S 16h to 1/8000 (1, 1/2 or 1/3 step)
ND Optical Density 0.1 to 6.0 (0.1 step) or F stop 1/3 to 20 (1/3 step)

How to use
http://www.youtube.com/watch?v=Z56pKMHzZOs