How long to image the Dumbbell Nebula with the DwarfLab DWARF mini
From a Bortle 6 suburban sky, the DwarfLab DWARF mini needs about 20 min (80 subs of 15 s with the built-in dual-band filter) for a solid image of the Dumbbell Nebula. A quick look takes 5 min; a showpiece 1 h 19 min. Under a Bortle 3 rural sky the solid figure drops to 15 min. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it fills 11% 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 min16 subs | 15 min61 subs | 1 h241 subs |
| Bortle 2Typical dark site | 4 min16 subs | 15 min61 subs | 1 h 01 min243 subs |
| Bortle 3Rural | 4 min16 subs | 15 min62 subs | 1 h 02 min248 subs |
| Bortle 4Rural / suburban transition | 4 min17 subs | 16 min65 subs | 1 h 04 min258 subs |
| Bortle 5Suburban | 4 min18 subs | 17 min69 subs | 1 h 09 min276 subs |
| Bortle 6Bright suburban | 5 min20 subs | 20 min80 subs | 1 h 19 min318 subs |
| Bortle 7Suburban / urban transition | 6 min25 subs | 25 min100 subs | 1 h 40 min399 subs |
| Bortle 8City | 8 min33 subs | 33 min132 subs | 2 h 11 min525 subs |
| Bortle 9Inner city | 12 min50 subs | 50 min199 subs | 3 h 18 min793 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 26 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 Dumbbell Nebula is 8′ × 5.7′ across. The DWARF mini frames 2.13° × 1.20° at 3.99″ per pixel, so it fills 11% 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 | 15 min62 subs | 17 min69 subs | 25 min100 subs |
| 30 s | 15 min30 subs | 15 min30 subs | 22 min45 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) | 12 min50 subs | 18 min73 subs | 43 min174 subs |
| dual-band | 15 min62 subs | 17 min69 subs | 25 min100 subs |
About the Dumbbell Nebula
The biggest, brightest planetary nebula for northern observers. Bright enough to look good in twenty minutes, and dual-band brings out the outer shell.
M27, NGC 6853 · Planetary nebula in Vulpecula · magnitude 7.4 · 8′ × 5.7′ · best in Jun, Jul, Aug. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.
Planetary nebulae are small but intensely bright per pixel in OIII and H-alpha, so they respond very well to a dual-band filter and do not need much time for the main shell. The faint outer halos most of them have are a different proposition and need hours. Keep subs short if the central region saturates.
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 Dumbbell 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
- Dumbbell Nebula with the ZWO Seestar S50: 20 min from Bortle 6
- Dumbbell Nebula with the ZWO Seestar S50 Pro: 22 min from Bortle 6
- Dumbbell Nebula with the ZWO Seestar S30: 23 min from Bortle 6
- Dumbbell Nebula with the ZWO Seestar S30 Pro: 24 min from Bortle 6
- Dumbbell Nebula with the DwarfLab DWARF 3: 27 min from Bortle 6
- Dumbbell Nebula with the DwarfLab Draco: 16 min from Bortle 6
- Dumbbell Nebula with the DwarfLab DWARF II: 1 h 30 min from Bortle 6
- Dumbbell Nebula with the Vaonis Vespera II: 27 min from Bortle 6
- Dumbbell Nebula with the Vaonis Vespera Pro: 1 h from Bortle 6
- Dumbbell Nebula with the Vaonis Vespera 3: 26 min from Bortle 6
- Dumbbell Nebula with the Vaonis Vespera Pro 2: 57 min from Bortle 6
- Dumbbell Nebula with the Unistellar eQuinox 2: 24 min from Bortle 6
- Dumbbell Nebula with the Unistellar Odyssey: 1 h 47 min from Bortle 6
- Dumbbell Nebula with the Celestron Origin: 7 min from Bortle 6
- Dumbbell Nebula with the Celestron Origin Mark II: 10 min from Bortle 6
All telescopes for the Dumbbell Nebula · All targets for the DWARF mini