How long to image the Omega Nebula with the DwarfLab DWARF mini
From a Bortle 6 suburban sky, the DwarfLab DWARF mini needs about 23 min (91 subs of 15 s with the built-in dual-band filter) for a solid image of the Omega Nebula. A quick look takes 6 min; a showpiece 1 h 31 min. Under a Bortle 3 rural sky the solid figure drops to 17 min. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it fills 15% of the frame’s short side.
| Sky | Quick lookTarget obvious, still noisy | SolidClean enough to share | ShowpieceSmooth faint detail, print-worthy |
|---|---|---|---|
| Bortle 1Excellent dark site | 4 min17 subs | 17 min67 subs | 1 h 06 min266 subs |
| Bortle 2Typical dark site | 4 min17 subs | 17 min68 subs | 1 h 07 min269 subs |
| Bortle 3Rural | 4 min18 subs | 17 min69 subs | 1 h 08 min274 subs |
| Bortle 4Rural / suburban transition | 4 min18 subs | 18 min72 subs | 1 h 12 min288 subs |
| Bortle 5Suburban | 5 min20 subs | 19 min78 subs | 1 h 17 min310 subs |
| Bortle 6Bright suburban | 6 min23 subs | 23 min91 subs | 1 h 31 min364 subs |
| Bortle 7Suburban / urban transition | 7 min30 subs | 29 min117 subs | 1 h 56 min466 subs |
| Bortle 8City | 10 min40 subs | 39 min157 subs | 2 h 36 min625 subs |
| Bortle 9Inner city | 15 min61 subs | 1 h241 subs | 4 h 01 min964 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 30 min of run time. The DWARF mini’s battery (rated about 3 h 30 min) should cover it; a power bank still keeps the phone running the app alive. (Bortle 6, solid image; we allow 30% over the integration time.)
- USB-C PD power bank 10000mAh 20W7,000 mAh inside, about four hours; a PD bank extends the night.
- red LED head torchRed light keeps your night vision; white light costs you twenty minutes of dark adaptation every time.
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Everything that fits the DWARF mini →
How it frames
The Omega Nebula is 11′ across. The DWARF mini frames 2.13° × 1.20° at 3.99″ per pixel, so it fills 15% of the frame’s short side.
Longer subs
Auto mode caps subs at 15 s; 30 s and longer need EQ mode, and 90 s is the ceiling. Time for a solid image by sub length:
| Sub length | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| 15 s | 17 min69 subs | 19 min78 subs | 29 min117 subs |
| 30 s | 15 min30 subs | 16 min32 subs | 26 min52 subs |
| 60 s | 30 min30 subs | 30 min30 subs | 30 min30 subs |
| 90 s | 45 min30 subs | 45 min30 subs | 45 min30 subs |
With and without the dual-band filter
| Filter | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| Astro (no light-pollution filter) | 14 min57 subs | 21 min86 subs | 53 min213 subs |
| dual-band | 17 min69 subs | 19 min78 subs | 29 min117 subs |
About the Omega Nebula
A bright, compact swan-shaped emission nebula, one of the brightest in the sky per unit area. Excellent from suburban skies.
M17, NGC 6618, Swan Nebula · Emission nebula in Sagittarius · magnitude 6.0 · 11′ · best in Jun, Jul, Aug. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.
Emission nebulae glow in a few narrow lines, mostly hydrogen-alpha (deep red) and doubly ionised oxygen (teal). A dual-band filter passes those lines and blocks most skyglow, which is why it cuts the time needed from a suburban sky so dramatically. Use it. From a genuinely dark site the gain is smaller because there is less skyglow to block, and read noise becomes the limit, which is where longer subs (EQ mode, or Expert Mode on a Vespera) earn their keep.
Stars lose colour through a dual-band filter; a short broadband stack blended in fixes that if you care.
About the DwarfLab DWARF mini
DwarfLab’s answer to the Seestar S30: same sensor and focal length, big pixels, dual-band filter built in, and 90 s subs in EQ mode. Sensitivity over megapixels.
Auto mode caps subs at 15 s; 30 s and longer need EQ mode, and 90 s is the ceiling. Built-in Astro (430 to 690 nm), dark-frame and dual-band Hα / OIII filters; no plain VIS filter on the tele camera.
Longer subs matter most under dark skies, where read noise rather than skyglow sets the floor. From a city the difference between 15 s and 90 s subs is small; from a rural site it can halve the total time, especially with a dual-band filter in place.
Stack across nights. Every smart scope app can continue a stack or you can combine the saved frames on a computer; the figures here are totals, not single-session limits.
Have an image of the Omega Nebula from a DWARF mini? Email it with your total time and sky to [email protected] and it goes here, credited.
Same target, other telescopes
- Omega Nebula with the ZWO Seestar S50: 23 min from Bortle 6
- Omega Nebula with the ZWO Seestar S50 Pro: 26 min from Bortle 6
- Omega Nebula with the ZWO Seestar S30: 26 min from Bortle 6
- Omega Nebula with the ZWO Seestar S30 Pro: 27 min from Bortle 6
- Omega Nebula with the DwarfLab DWARF 3: 30 min from Bortle 6
- Omega Nebula with the DwarfLab Draco: 18 min from Bortle 6
- Omega Nebula with the DwarfLab DWARF II: 1 h 49 min from Bortle 6
- Omega Nebula with the Vaonis Vespera II: 32 min from Bortle 6
- Omega Nebula with the Vaonis Vespera Pro: 1 h 12 min from Bortle 6
- Omega Nebula with the Vaonis Vespera 3: 31 min from Bortle 6
- Omega Nebula with the Vaonis Vespera Pro 2: 1 h 09 min from Bortle 6
- Omega Nebula with the Unistellar eQuinox 2: 29 min from Bortle 6
- Omega Nebula with the Unistellar Odyssey: 2 h 11 min from Bortle 6
- Omega Nebula with the Celestron Origin: 9 min from Bortle 6
- Omega Nebula with the Celestron Origin Mark II: 12 min from Bortle 6
All telescopes for the Omega Nebula · All targets for the DWARF mini