M33 - 20221211 - Samyang 135 mm at F2 - IR (altazastro)

Celestial hemisphere: Northern · Constellation: Triangulum (Tri) · Contains: M 33 · NGC 598 · Triangulum Galaxy · Triangulum Pinwheel

M33 - 20221211 - Samyang 135 mm at F2 - IR, altazastro

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M33 - 20221211 - Samyang 135 mm at F2 - IR

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

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M33 - 20221211 - Samyang 135 mm at F2 - IR

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

After an unsuccessful attempt to obtain a decent image of M33 with near full moon in the visible spectrum (using an UV/IR CUT filter) with 15 seconds exposures of the Samyang 135 mm at F2 (too much banding and gradients), I retried with an IR bandpass filter (642-842 nm) and the result was way better (perhaps also because the moon was a bit beyond full), with the exception of the quite puffy stars.
Since not all stars are bloated, indeed some are quite punctiform, my guess is that the Samyang lens is not focusing perfectly in the near infrared (after all it is a general photography lens, albeit quite popular in astrophotography) and that some stars have more IR emission that others (this too not a surprise).

Final
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Title: Live EAA

Description: As it was on screen after 70 minutes of live stacking with SharpCap.

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Broadband under Bortle 7/8/9
Low-Cost Astrophotography

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M33 - 20221211 - Samyang 135 mm at F2 - IR

M33 - 20221211 - Samyang 135 mm at F2 - IR

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M33 - 20221211 - Samyang 135 mm at F2 - IR

M33 - 20221211 - Samyang 135 mm at F2 - IR

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