A better attempt at photostacking

High res image

Original Post

This time i set up my old dslr and a tripod for the shooting, and i shot 70 30s frames. It seems like there's a problem with sharpness, but im not sure if its because i lack a star tracker, the lens was slightly out of focus, or because of atmospheric wobble.

Here's some behind the scene images:

The camera is a nikon D5100, a low/midrange camera from almost 14 yeas ago mounted to a cheap tripod. The white box on top of said camera is the battery which i made from 2 old powerbanks because im a cheapass and couldnt be asked to buy a proper one :)

I saw the nothern lights too!