How long to image the Dumbbell Nebula with the DwarfLab DWARF 3
From a Bortle 6 suburban sky, the DwarfLab DWARF 3 needs about 27 min (107 subs of 15 s with the built-in dual-band filter) for a solid image of the Dumbbell Nebula. A quick look takes 7 min; a showpiece 1 h 46 min. Under a Bortle 3 rural sky the solid figure drops to 20 min. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it fills 8% 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 | 5 min20 subs | 19 min77 subs | 1 h 16 min306 subs |
| Bortle 2Typical dark site | 5 min20 subs | 19 min78 subs | 1 h 17 min310 subs |
| Bortle 3Rural | 5 min20 subs | 20 min80 subs | 1 h 19 min317 subs |
| Bortle 4Rural / suburban transition | 5 min21 subs | 21 min84 subs | 1 h 23 min333 subs |
| Bortle 5Suburban | 6 min23 subs | 22 min90 subs | 1 h 30 min360 subs |
| Bortle 6Bright suburban | 7 min27 subs | 27 min107 subs | 1 h 46 min426 subs |
| Bortle 7Suburban / urban transition | 9 min35 subs | 34 min138 subs | 2 h 18 min551 subs |
| Bortle 8City | 12 min47 subs | 47 min187 subs | 3 h 06 min745 subs |
| Bortle 9Inner city | 18 min73 subs | 1 h 12 min290 subs | 4 h 50 min1,159 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 35 min of run time. The DWARF 3’s battery (rated about 5 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 20000mAh 18W18 W PD input and it runs while charging; needs a C-to-C cable for PD.
- 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 3 →
How it frames
The Dumbbell Nebula is 8′ × 5.7′ across. The DWARF 3 frames 2.93° × 1.65° at 2.75″ per pixel, so it fills 8% of the frame’s short side.
Longer subs
Auto mode caps subs at 15 s; 30 s and longer need EQ mode, and 60 s is the ceiling on the tele camera. Time for a solid image by sub length:
| Sub length | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| 15 s | 20 min80 subs | 22 min90 subs | 34 min138 subs |
| 30 s | 18 min37 subs | 21 min42 subs | 33 min66 subs |
| 60 s | 30 min30 subs | 30 min30 subs | 32 min33 subs |
With and without the dual-band filter
| Filter | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| Astro (no light-pollution filter) | 17 min69 subs | 26 min105 subs | 1 h 05 min261 subs |
| dual-band | 20 min80 subs | 22 min90 subs | 34 min138 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 3
Small pixels on a 35 mm f/4.3 lens give a sharper image than its aperture suggests, and EQ mode with 60 s subs makes it the read-noise winner in dark skies.
Auto mode caps subs at 15 s; 30 s and longer need EQ mode, and 60 s is the ceiling on the tele camera. Three built-in filters: VIS, Astro (430 to 690 nm) and dual-band Hα 656 nm / OIII 501 nm.
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 60 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 3? 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 mini: 20 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 3