Hemisphere:  Northern  ·  Constellation: Cepheus (Cep)
Sh2-155 - The Cave Nebula, 


            Jason Guenzel
Sh2-155 - The Cave Nebula
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Sh2-155 - The Cave Nebula

Technical card

Imaging telescopes or lenses: Explore Scientific AR152 Achromatic Refractor

Imaging cameras: ZWO ASI183MM Pro

Mounts: Celestron Advanced VX

Guiding telescopes or lenses: Orion 60mm Guidescope

Guiding cameras: ZWO ASI224MC

Focal reducers: Explore Scientific 3" 0.7x Reducer/Flattener

Software: Sequence Generator Pro  ·  PixInsight  ·  Adobe Photoshop  ·  PHD 2

Filters: Astronomik H-alpha 6nm CCD 1.25"  ·  Astronomik OIII 6nm CCD 1.25"

Dates:Aug. 7, 2020

Astronomik H-alpha 6nm CCD 1.25": 33x240" (gain: 111.00) -20C bin 1x1
Astronomik OIII 6nm CCD 1.25": 14x240" (gain: 111.00) -20C bin 1x1

Integration: 3.1 hours

Darks: ~50

Flats: ~50

Bias: ~256

Avg. Moon age: 18.39 days

Avg. Moon phase: 85.88%

Bortle Dark-Sky Scale: 5.00

Basic astrometry details

Astrometry.net job: 3738593

RA center: 22h 56' 36"

DEC center: +62° 35' 16"

Pixel scale: 1.565 arcsec/pixel

Orientation: 333.015 degrees

Field radius: 0.557 degrees

Resolution: 1600x2000

Data source: Backyard


Seems every post I make now is with a different set of gear. This switches it up again. I’ve always been intrigued by the prospect of shooting quality narrowband through my big 6” achromatic refractor telescope.

This image proved to me that it can absolutely be a reality. They don’t focus all light to the same point but with the proper filtration, you can sidestep this limitation. In this way you can get pretty decent quality at “more reasonable” prices. Just my style.

Too good to be true?
Proof’s in the puddin’

I framed up the Cave Nebula here as my test shot.

How I arrived at this bicolor mix? I haven’t a clue 😆


Sky plot

Sky plot


Sh2-155 - The Cave Nebula, 


            Jason Guenzel

In these public groups

Cloudy Nights
Narrowband imaging