JaeNDC

When you use ND Filters in photography, JaeNDC can help you to calculate how you need to adapt exposure times. An ND Filter is a neutral density filter which you put in front of your lens and which removes light from the lightpath into the camera in order to allow for longer exposure times.

In JaeNDC you select your ND Filter and the "normal" exposure that the scene would take without ND Filter (which you may have measured with the camera or with an external light meter), and the app will calculate for you how long the exposure time should be with the ND Filter.

• You can optionally select a single or multiple ND Filters.
• The top large text line shows the result as a camera-settable time; a BULB tag indicates long exposure.
• When the calculated exposure time is four seconds or more (configurable), you can also start a timer while taking the picture, which will notify you when the time is over / when you can stop the exposure, even when the app has been closed meanwhile. Please check if this is precise enough for you even in case when the device is sleeping, otherwise please try with the "Use alarm clock" option (Android 5 and higher).
• You can place one or more independent AppWidgets (Android 3 or higher) of JaeNDC on the homescreen.
• You can add/edit/delete filters to match your personal filter collection (feature not available when running on old Android 2.x devices).
* You can select different camera times: 1/3-stops or 1/2-stops and also two different models for naming the times between 1/4s and 1s.

Known issues and limitations:
• On some older(?) Android versions the numeric screen keyboard does not really respect locale, so it does not allow you to enter the localized decimal separator. This is bad when editing filters and wanting to enter fractions. No problem as long as your locale is set to an English-based one or if your locale uses a decimal point, too. The problem may turn up with locales which use decimal comma.
• Android's homescreen widgets do not seem to be made for as "complex" interactions as JaeNDC's. I tried to reduce the unwanted surprises as much as I could catch them through the available Android APIs, but there are nevertheless some situations where the list selections may disappear visually. This is also the reason why the homescreen widgets do not allow for multiselections as in the main app.

JaeNDC is modeled after Boris Nienke's popular NDCalc2 app for iOS and has meanwhile received a few additional features; this JaeNDC Android app is actually a nice exercise in Android app development for me. For those who know how to use it, the JaeNDC source code is available at https://github.com/rfuxx/jaendc-android

For feedback, issues and suggestions please contact me at the listed email address so that we can discuss about details and feasibilities. (I am a private person and will not always find time - to reviews in the PlayStore I cannot respond, not even for clarification if some would be needed :-) )