DiapScope

Turn your smartphone into a light table.

Allows you to adjust the size of the viewport lighting in order to be able to adapt to the size of the negative ...it's a lightbox app that turns the screen on full-blast white, and configures a window size on the screen so there won't be a lot of light spill around the neg or slide you're viewing.

Now you can:
- set the frame number
- set the distance between frames depending on your needs