If you are going to combine two or more images into one. it is important to set the correct exposure correction for each frame. This tool tells you the exposure correction and estimates the total time you'll spend on making all the shots.
Estimate how much time it will take to shoot all the frames
MULTIPLE EXPOSURES AND ND FILTERS
Instead of setting the exposure compensation for each frame you can use Multiple exposure technique in combination with ND filters. In this case you should recalculate the final exposure time for each frame.
UP TO 3 FILTERS
You can use up to three ND filters
You don't need to count the frames left yourself anymore
Run the timer and get notified when it is done!
Watch this short tutorial to see the Multiple Exposures calculator in action!