M31 Andromeda galaxy wide field + synthetic flat showcase (stalv0812)

Celestial hemisphere: Northern · Constellation: Andromeda (And) · Contains: 32 And · 35 And · 35 nu. And · Andromeda Galaxy · M 110 · M 31 · M 32 · NGC 205 · NGC 206 · NGC 221 · NGC 224 · The star 32 And · The star ν And

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M31 Andromeda galaxy wide field + synthetic flat showcase

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M31 Andromeda galaxy wide field + synthetic flat showcase

Couple of months ago I tried to shoot some subs with my mirrorless camera Fujifilm X-E4 and Fuji 55-200mm lens. Initially, things were looking good, but after calibration and stacking I saw some concentric color rings on my master light image. Some googling showed that the built-in lens distortion correction is to blame for them.

Later, I found the blog post about synthetic flats(Remove Image Defects With a Synthetic Flat Frame) where author showed how to make a "flat" frame to get rid of some unwanted artifacts.

I followed it: removed stars with StarXterminator, brushed out galaxies, blurred image a bit and substracted it from the master light. Results you can see on the final revision, revision B shows original master light image. Note, that I cropped final one just a little.

Final
Original
B

B

Title: Original image with artefacts

Description: Original image with camera lens distortion correction artifacts.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	6874021
PixInsight job	C8HHZV18APCBZ4HJIM3F0IJSVNG0XK5U
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h42m05s.78
RA (top/left)	00h30m09s.54
RA (top/right)	00h31m49s.90
RA (bottom/right)	00h53m11s.46
RA (bottom/left)	00h53m22s.66

Dec (center)	+40°46′45″.9
Dec (top/left)	+43°40′24″.8
Dec (top/right)	+37°40′39″.7
Dec (bottom/right)	+37°45′50″.6
Dec (bottom/left)	+43°47′12″.9

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M31 Andromeda galaxy wide field + synthetic flat showcase

M31 Andromeda galaxy wide field + synthetic flat showcase

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M31 Andromeda galaxy wide field + synthetic flat showcase

M31 Andromeda galaxy wide field + synthetic flat showcase

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