[Solved] Black pixel issue after extracting Olll using a OSC camera

Hi guy's,

I've just discovered a new issue regarding my extracted Oll image using a OSC camera and a Ha/Olli dual narrow band filter.

This is the first time I've encountered such problem whilst using the same set  up for the past 12 months.

My HA image looks great following subtraction, however the Oll image contains a mixture of single, double and quadruple black pixels. I've compared against all master calibration frames (pixel location doesn't match), it's clear to see something is going on during Olll extraction.

I dither by 15 pixels using SGPRO with no walking noise problems. What I find odd is that my previous image shot the night before doesn't contain such pixels whilst using the exact same setup and software/processing settings.

I'm no expert by all means, the only possible discrepancy I see is in the master dark data, sigma G2 is one digit less than the others. 

I'm wondering if it's worth adjusting my hot pixel/cold pixel settings and maybes making a new set of dark frames. I use x 50 darks taken 12 month's ago with no issues up until now.

I've attaches an image of the master dark fits header.

Many Thanks

Ryan