I am taking darks on a ZWO ASI183MC Pro and have a starburst pattern on the right of all the images. I have attached the relevant part of a stretched dark capture. This is taken lens cap on, sensor at -10 degrees, exposure is 120s. My first thought was maybe there's a light leak so have just tested again inside a dark bag - same result. This does not show up on bias exposures at 1/1000s.
Is this an issue or does it not matter as stacking will remove it?
Advice much appreciated.