RED master flat frame - STF stretched in Pixinsight - this was taken with the original filter orientation - the radial interference pattern is weakly noticeable and does seem to be present.
40 flat frames at 2.2 seconds using Sequence Generator Pro. Integration time was determined using SGP flats calibration wizard.
Illumination was using an Alnitak Flatman with two layers of tee shirt fabric.
No bias frames used only Flat Dark Frames - 40 flat dark frames
ORION EON 115mm APO
ZWO ASI1600MM-COOL with a Williams Optics Flattener IV at F/5.75 with Gain - 75, Offset - 40, USB - 60, Temp = -15C
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