Celestial hemisphere:  Northern  ·  Constellation: Cepheus (Cep)
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The Cave Nebula - Sh2-155, astrodawg
The Cave Nebula - Sh2-155
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The Cave Nebula - Sh2-155

Getting plate-solving status, please wait...
The Cave Nebula - Sh2-155, astrodawg
The Cave Nebula - Sh2-155
Powered byPixInsight

The Cave Nebula - Sh2-155

Equipment

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Description

This was the very first thing I've imaged with a new telescope, a 6" Orion Newtonian reflector, F4 astrograph, 610mm focal length. Up to this point, everything else I had imaged had been done through my 5" Maksutov-Cassegrain, F9 with a focal reducer & about a 1200mm focal length. That was all that I knew & I have enjoyed it & had become quite used to the tighter views of a longer focal length & exposure times needed with a slower setup. I still like that setup & have no intentions of getting rid of it.

I ordered the Orion Newtonian Astrograph in mid-March & finally 7 full months later (nearly to the day) I eventually received it in mid-October. A wide field F4 was definitely an adjustment for me. It was a jolt going from a slow setup to something so fast, but I sure am not complaining. I was still learning to gauge what a proper exposure length needed to be at F4 through most of this project. It was also nice to have a fully usable field that I didn't have to crop much out of. That simply is not & will never be the case with my mak-cas through the 0.63 reducer as there is no reducer available that was specifically designed for that scope, so there is some coma & significant vignetting at the edges of the field I can never fully process out.

The detail from this image came from the Optolong L-Extreme duo narrowband filter. The stars came from the L-Pro, broadband light pollution filter. I had initially intended to make this a blend of the two completely, but so little detail came from the broadband filter (through bortle 7) that it offered nothing that I did not get in spades from the other filter.

The Cave is an interesting object & oddly doesn't seem to be well represented on this forum. It won't be the last time I image this one.

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The Cave Nebula - Sh2-155, astrodawg

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