Dont bother

The photo is a composite of a bunch of images from a video, basically. The crop factor is the same as if youre shooting a video. Not sure how the full 3264×2448 resolution is achieved even with the crop factor, perhaps upsized?

This isnt a true solution for slow shutter. I would try something like Cortex Cam even though you dont have as much control, but at least you get the full resolution.

rebeccamissing about Slow Shutter!, v1.1