1:ND Filter Shutter Speed Sheet.(Just Swipe ND2〜ND1,000,000) 2:ND Filter Calculator. So Easy and Useful. It is very helpful when taking a long time exposure photograph. ■A Christmas gift for you!! It is Free from 19th to 25th. ■1:ND Filter Shutter Speed Sheet. ND Filter f-stop : 1Stop(ND2/0.3)〜20Stop(ND1,000,000/6.0) Shutter Spead : 1/8000〜30s ■2:ND Filter Calculator. In the case of over 1 second,Please use the calculator. Please take advantage of this application and enjoy great a long time exposure photography. ------------------------- ■World Review Great !!! ⋆⋆⋆⋆⋆ Does exactly what it is suppose to do ! Very easy to use !!! Thanks !!! Awesome!! ⋆⋆⋆⋆⋆ Awesome app. No need for any calculation, just have your camera meter the scene and all you need to do is compensate the time you need using this chart to keep the shutter open depending on how much stops of ND filters you stacked. Simple and Easy ⋆⋆⋆⋆⋆ A well designed straight forward chart. Simpele And effective ⋆⋆⋆⋆⋆ Everything you need , nothing fancy thought works very simple , got nothing to add just an amazing app Does what's supposed to ⋆⋆⋆⋆⋆ Very simple app that does exactly what's it supposed to do. Tried others and in my opinion this works best. ＊2016/02 Add ND Filter f-stop : 11stop〜20stop. Change ND Filter Sheet more usefull.