How long to image the Trifid Nebula with the DwarfLab DWARF mini
From a Bortle 6 suburban sky, the DwarfLab DWARF mini needs about 43 min (173 subs of 15 s with the built-in dual-band filter) for a solid image of the Trifid Nebula. A quick look takes 11 min; a showpiece 2 h 53 min. Under a Bortle 3 rural sky the solid figure drops to 31 min. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it fills 39% 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 | 7 min30 subs | 30 min119 subs | 1 h 58 min474 subs |
| Bortle 2Typical dark site | 8 min31 subs | 30 min121 subs | 2 h481 subs |
| Bortle 3Rural | 8 min31 subs | 31 min124 subs | 2 h 03 min493 subs |
| Bortle 4Rural / suburban transition | 8 min33 subs | 33 min131 subs | 2 h 11 min524 subs |
| Bortle 5Suburban | 9 min36 subs | 36 min143 subs | 2 h 23 min572 subs |
| Bortle 6Bright suburban | 11 min44 subs | 43 min173 subs | 2 h 53 min691 subs |
| Bortle 7Suburban / urban transition | 14 min58 subs | 57 min230 subs | 3 h 49 min918 subs |
| Bortle 8City | 20 min80 subs | 1 h 19 min318 subs | 5 h 17 min1,270 subs |
| Bortle 9Inner city | 32 min127 subs | 2 h 06 min505 subs | 8 h 25 min2,020 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 56 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 Trifid Nebula is 28′ across. The DWARF mini frames 2.13° × 1.20° at 3.99″ per pixel, so it fills 39% 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 | 31 min124 subs | 36 min143 subs | 57 min230 subs |
| 30 s | 23 min47 subs | 28 min57 subs | 50 min100 subs |
| 60 s | 30 min30 subs | 30 min30 subs | 46 min47 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) | 26 min105 subs | 42 min170 subs | 1 h 53 min452 subs |
| dual-band | 31 min124 subs | 36 min143 subs | 57 min230 subs |
About the Trifid Nebula
Red emission, blue reflection and dark lanes in one object. Shoot it without a filter to keep the blue, or dual-band for the red.
M20, NGC 6514 · Emission nebula in Sagittarius · magnitude 6.3 · 28′ · 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 Trifid 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
- Trifid Nebula with the ZWO Seestar S50: 44 min from Bortle 6
- Trifid Nebula with the ZWO Seestar S50 Pro: 49 min from Bortle 6
- Trifid Nebula with the ZWO Seestar S30: 51 min from Bortle 6
- Trifid Nebula with the ZWO Seestar S30 Pro: 53 min from Bortle 6
- Trifid Nebula with the DwarfLab DWARF 3: 55 min from Bortle 6
- Trifid Nebula with the DwarfLab Draco: 35 min from Bortle 6
- Trifid Nebula with the DwarfLab DWARF II: 3 h 48 min from Bortle 6
- Trifid Nebula with the Vaonis Vespera II: 1 h 07 min from Bortle 6
- Trifid Nebula with the Vaonis Vespera Pro: 2 h 30 min from Bortle 6
- Trifid Nebula with the Vaonis Vespera 3: 1 h 04 min from Bortle 6
- Trifid Nebula with the Vaonis Vespera Pro 2: 2 h 23 min from Bortle 6
- Trifid Nebula with the Unistellar eQuinox 2: 1 h from Bortle 6
- Trifid Nebula with the Unistellar Odyssey: 4 h 39 min from Bortle 6
- Trifid Nebula with the Celestron Origin: 18 min from Bortle 6
- Trifid Nebula with the Celestron Origin Mark II: 24 min from Bortle 6
All telescopes for the Trifid Nebula · All targets for the DWARF mini