32 minutes exposure time ALP-T Test - NGC 2359 Thor's Helmet (Mau_Bard)

Celestial hemisphere: Southern · Constellation: Canis Major (CMa) · Contains: HD56501 · HD57008 · HD57027 · HD57057 · HD57083 · HD57369 · IC 468 · NGC 2359 · Sh2-298

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32 minutes exposure time ALP-T Test - NGC 2359 Thor's Helmet

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32 minutes exposure time ALP-T Test - NGC 2359 Thor's Helmet

I've just received a brand new ALP-T dual-band filter and I was eager to test it. The night of 22 February 2023 seemed promising, unfortunately bad weather, that is persistent in the last 3,5 months now, made me stop when only 4 acceptable sub-exposures were taken.
I decided to process them anyway, without flats, just to see how the filter by and large worked. I got some odd asymmetric halos around a few large stars, probably because the Antlia is not parfocal with my current Optolong filters, or because the altitude was modest, or because it is particularly sensitive to some tilting I never noted. I do not think it is mirror collimation. Apart from that, the image produced by the filter is clear and contrasty. Diagnosis/advice is welcome.

Just a few words about NGC 2359 also known as Sh2-298 or RCW 5 or Gum4.
Nicknamed Thor's Helmet, this nebula is a wind blown bubble ionised by the Wolf-Rayet star WR 7 (HD 56925). Naturally, with such short exposure, the external arms of the nebula have not been properly captured.

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Status	Advanced success
Started	...
Astrometry.net job	7233160
PixInsight job	YWD063YRUAQ0CSS5NQPDCFEFVX4J9B51
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	07h18m32s.577
RA (top/left)	07h20m27s.768
RA (top/right)	07h16m38s.400
RA (bottom/right)	07h16m36s.788
RA (bottom/left)	07h20m27s.670

Dec (center)	-13°13′21″.39
Dec (top/left)	-12°53′22″.64
Dec (top/right)	-12°52′55″.19
Dec (bottom/right)	-13°33′19″.80
Dec (bottom/left)	-13°33′45″.23

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32 minutes exposure time ALP-T Test - NGC 2359 Thor's Helmet

32 minutes exposure time ALP-T Test - NGC 2359 Thor's Helmet

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32 minutes exposure time ALP-T Test - NGC 2359 Thor's Helmet

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