"Streaks"

[brenski]

so fresh from the "dust" and "zigzags" there's a brand new phenomena "streaks"

♦ Zwo ASI 183MC Pro (cooled) ♦ Skywatcher Evostar 72ED DS-Pro ♦ SW Star Adv Pro 2i ♦ Optolong UHC LPF 2" ♦ Stellamira Field Flattener / 0.8 Reducer
♣ Lights are 30s 150gain (x60)
♣ Darks are 30s 150gain (x15)

They appear to move from 5 O'Clock toward 11 O'clock across the image in a uniform manner.
There's definitely something going on with my setup. Either that or I'm a simpleton.
These Images have been "lightened" to highlight the "streaks". Any ideas?

[Juno16]

Are you dithering?

[brenski]

thanks, yes. but i think I've found what this is.
One of my "darks" was actually my final Light.

[Gordon]

thanks, yes. but i think I've found what this is.
One of my "darks" was actually my final Light.

That would do it!!