For what it's worth, I consider 15 shots preferable: larger gaps between frames allow the negative carrier to do its job better (for frames at one end of a strip of 4) to hold the edges and keep the inside flat.
For what it's worth, I consider 15 shots preferable: larger gaps between frames allow the negative carrier to do its job better (for frames at one end of a strip of 4) to hold the edges and keep the inside flat.