You say
"My cameras don’t do video so this is just a single frame"
IT does, in a way and you are not using it
It is an old camera, way back I had the 300, but
Simple
set it to JPG, 200 iso,
set the camera to continuous which will shoot 14 jpgs, and then you simply stack them
remember to use the link I have attached that I always post
Make and use this
http://www.mikeoates.org/mas/projects/calc/
I always bracket at least 8 either side, the Mooon is NOT as simple as people think to image,