"?"Nebula, Rok135mm unguided (TStew)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: NGC 7762 · NGC 7822

"?"Nebula, Rok135mm unguided

Here we have the Question Mark Nebula. Instead of a '?' I often see a skull shape, so I personally call this one the Red Skull. Not sure if that name is taken or not.
This was a bit of an experiment. With my new EQ6 mount going and not having a guider left over for my SkyGuider I decided to try for a wider angle object to use my 135mm Rokinon on unguided. Problem is most of these larger nebula are emission type and benefit from narrowband so I tried this one with my NBZ nebula booster narrowband filter and pushed my luck with 300" subs and shooting the Rok wide open. However the filter itself, attached with step down ring to the front should have the effect of reducing the aperture from f/2 to ~f/2.8. So this was a compromise, trying to get that faint Ha signal with long exposure but at risk of tracking issues. I had another issue working against me, the self mod I did to my SL1 camera resulted in a bit of sensor tilt, and toward the bottom of this image the stars really went out of focus. I was able to crop the worse parts but didn't want to remove the question mark's dot so trimmed up to that point. At least its something, with minimalist equipment. I hate to waste the new moon phase when I had the tracker sitting there available. While the stars aren't super sharp I am happy there was no trailing issues at 5 minutes unguided.

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	Image of the day	Top pick	Top pick nominations	Total submitted
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	Image of the day	Top pick	Top pick nominations	Total submitted
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Other
Unknown

The “AstroBin Image of the Day and Top Picks”, or IOTD/TP, is a long-running system to promote beautiful, interesting, peculiar, or otherwise amazing astrophotographs, with a focus on technical excellence. Learn more.

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
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Status	Basic success
Started	...
Astrometry.net job	5298660
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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"?"Nebula, Rok135mm unguided

"?"Nebula, Rok135mm unguided

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Image Index:

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"?"Nebula, Rok135mm unguided

"?"Nebula, Rok135mm unguided

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Sky plot

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