[Russj (Russ)]

Hello all,
I have a problem with streaky mottled backgrounds in my last set of data, the data is taken with,

ASI1600mm pro, ZWO filterwheel, Zwo LRGB filters thru an 8" newt

90x60sec for each channel @75 gain, images were dithered every 3rd frame. The frames were taken over 3 evenings.

The pattern varies from channel to channel sometimes its at 45 degress, on other channels is vertical or just generally mottled.
I've tried processing in BPP and manually with similar results.

Can anyone suggest what might be causing this and/or a processing fix in PI.

Regards Russ