Hi, Since a long time l have 2 verticals lines into a light, dark or bias frame. If i take a sub frame i have the same 2 verticals lines. Verticals lines are always at column 1 and 5. At full frame: Column 1 and 5 are bad In a sub frame coming from the center of the chip column 1 and 5 are bad In a sub frame coming from the right side of the chip column 1 and five are bad ... Same problem even i use MaximDl or TheSkyX Because of this, this can't be a defect column into the chip .. Subframe: Full frame: Any idea ?