Hi @gyldenhorn !
Do you know an app called LEE Filters - Stopper Exposure Guide ?
This application is available on iOS and helps owners of filters Little Stopper (6 stops), Big Stopper (10 stops) and Super Stopper (15 stops) to calculate precise way the exposure time necessary to well expose his image.
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Hi @Redouanemez, yes I am using that app all the time to find out the shutter time :)
Thx for the tip :)