Film Format Change Charge

What is a format change charge?
We must charge a fee to switch back and forth between formats. For example "regular 8, then super 8, then regular 8 again would incur a format change charge. To avoid this, keep all of your regular 8, super 8 and 16mm together in the transfer sequence. For example you can transfer a few 8mm reels, then your super 8 reels, then some16mm, even add some prints to the end without incurring this charge.
This is usually not a problem since most people shot regular 8mm film for a few years then upgraded to a super 8 camera. Prints and slides can also be added to your transfer, but a format change charge will be added if you put a few slides on the beginning of the video then add a few at the end.