The easiest and fastest way to calculate the exposure time when using neutral density filters or gray filters. What does ND Filter Expert do? With ND Filter Expert you can calculate the exposure time super fast and easy if you use ND filters on your SLR camera or if you want to know which ND filter to use for your photo. That's no problem. ND Filter Expert helps you get started with ND filters. The app gives you extensive information and simple step-by-step instructions on what a neutral density filter is and how to use it with your camera. In addition to the extensive tutorial, we offer you additional information and also give you recommendations for suitable accessories. Thus ND Expert offers you a complete package from start to finish for the use of ND filters. calculating or writing it down? Do you have all exposure times with ND filter in your head or do you always have to write them down? That's over now. Save the calculated exposure time as a favorite and quickly access it again. Problems with measuring the exposure time ? Do you also never know when the calculated exposure time is over or do you have to carry a stopwatch? ND Filter Expert has a built-in timer function that allows you to measure times accurately over three seconds. The app notifies you with an alarm and vibration when the timer expires. In the settings you will find different types of tones and vibration schemes to choose from. Can I combine filters? Yes, of course, because ND Filter Expert gives you the ability to calculate the exposure time of up to five combined filters. For each filter you can choose from the total number of all filters (ND1 - ND19) and combine them. We are a small two-man company and our apps are created entirely in our spare time. Therefore we use discreet advertising banners outside the main operation to reward the work on the apps a little. We put a lot of time, energy and love into these little helpers, to be able to provide you with the best possible result. If you want to support us, click on the small advertising banner from time to time or choose our premium version. Thanks a lot All ND Filter Expert functions at a glance: - Calculation of the time extension when using neutral density filters - Combine up to five different ND filters for the calculation - Information about neutral density filters, use of ND filters and useful accessories - Timer functionality for exposure times greater than three seconds - Favorites list for frequently used ND filter values - Solutions for frequently asked questions about the use of neutral density filters - Setting options for the timer - Different vibration modes for the timer - Alarm with sound when the timer expires - No unnecessary authorizations; minimal authorizations - Easy handling - Further setting options - Attractive design - Support for the application If you decide for our Premium Version you will also get: - Ad-free version of the application. All banners are hidden - Additional calculation methods to calculate a required ND filter or the light value - Save combined filter calculations as a favorite - Infinite number of favorites - Jump from Favorites to the calculation or the timer - Filter & search within your favorites - Activate further content - Further adjustment possibilities - You support the further development of this app If you have any questions about the app or ideas, feel free to contact us. We are available for you at support@nd-filter-expert.com. For more information about ND Filter Expert, please visit www.nd-filter-expert.de. Note: To make this app available for free it contains advertising. All premium features can be unlocked by Inapp purchase or installed as a standalone app "ND Filter Expert Pro".