The best ND calculator I have ever used. Simple, accurate, and has all the right features for calculating exposure with a neutral density filter. Keep up the good work.
Does one job well.
I've tried other apps, and this one has the best set of features, and is accurate. Of course you should always test your ND filters for their exact f-stop number, because they may be slightly different from the manufacturer's claim, and so slight differences in exposure settings are not the fault of the app.
It is really useful when the light is tricky and you have had to change your f stop or shutter speed and you don't have (or don't trust) your light meter. Limited times that it is needed, but in those times it has great usefulness. Well supported by the developer.
Fantastic app. I'm do a good deal of long exposure shooting and this app is a brilliant way to save doing math at -6C. I just love the night feature.
ND calibration feature.