How long to image the Flame Nebula with the DwarfLab DWARF 3
From a Bortle 6 suburban sky, the DwarfLab DWARF 3 needs about 40 min (162 subs of 15 s with the built-in dual-band filter) for a solid image of the Flame Nebula. A quick look takes 10 min; a showpiece 2 h 41 min. Under a Bortle 3 rural sky the solid figure drops to 27 min. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it fills 30% 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 | 6 min26 subs | 26 min104 subs | 1 h 43 min413 subs |
| Bortle 2Typical dark site | 7 min27 subs | 26 min105 subs | 1 h 45 min420 subs |
| Bortle 3Rural | 7 min28 subs | 27 min109 subs | 1 h 48 min434 subs |
| Bortle 4Rural / suburban transition | 7 min30 subs | 29 min117 subs | 1 h 56 min466 subs |
| Bortle 5Suburban | 8 min33 subs | 32 min130 subs | 2 h 09 min518 subs |
| Bortle 6Bright suburban | 10 min41 subs | 40 min162 subs | 2 h 41 min645 subs |
| Bortle 7Suburban / urban transition | 14 min56 subs | 55 min222 subs | 3 h 42 min887 subs |
| Bortle 8City | 20 min79 subs | 1 h 19 min316 subs | 5 h 16 min1,263 subs |
| Bortle 9Inner city | 32 min130 subs | 2 h 09 min517 subs | 8 h 36 min2,065 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 52 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, and 30% off the battery for a December night.)
- 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.
- hand warmers long lastingAir-activated packs give hours of heat for the person; winter nights are long and you spend most of them standing still.
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Everything that fits the DWARF 3 →
How it frames
The Flame Nebula is 30′ across. The DWARF 3 frames 2.93° × 1.65° at 2.75″ per pixel, so it fills 30% 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 | 27 min109 subs | 32 min130 subs | 55 min222 subs |
| 30 s | 24 min49 subs | 29 min59 subs | 52 min105 subs |
| 60 s | 30 min30 subs | 30 min30 subs | 51 min51 subs |
With and without the dual-band filter
| Filter | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| Astro (no light-pollution filter) | 26 min103 subs | 43 min172 subs | 1 h 58 min473 subs |
| dual-band | 27 min109 subs | 32 min130 subs | 55 min222 subs |
About the Flame Nebula
A bright emission nebula beside Alnitak, split by a dark lane like a tree. Alnitak's glare is the main problem; keep it out of the frame if you can.
NGC 2024 · Emission nebula in Orion · magnitude 10.0 · 30′ · best in Nov, Dec, Jan. 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 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 Flame 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
- Flame Nebula with the ZWO Seestar S50: 32 min from Bortle 6
- Flame Nebula with the ZWO Seestar S50 Pro: 35 min from Bortle 6
- Flame Nebula with the ZWO Seestar S30: 36 min from Bortle 6
- Flame Nebula with the ZWO Seestar S30 Pro: 38 min from Bortle 6
- Flame Nebula with the DwarfLab DWARF mini: 31 min from Bortle 6
- Flame Nebula with the DwarfLab Draco: 25 min from Bortle 6
- Flame Nebula with the DwarfLab DWARF II: 2 h 41 min from Bortle 6
- Flame Nebula with the Vaonis Vespera II: 47 min from Bortle 6
- Flame Nebula with the Vaonis Vespera Pro: 1 h 46 min from Bortle 6
- Flame Nebula with the Vaonis Vespera 3: 45 min from Bortle 6
- Flame Nebula with the Vaonis Vespera Pro 2: 1 h 41 min from Bortle 6
- Flame Nebula with the Unistellar eQuinox 2: 42 min from Bortle 6
- Flame Nebula with the Unistellar Odyssey: 3 h 15 min from Bortle 6
- Flame Nebula with the Celestron Origin: 13 min from Bortle 6
- Flame Nebula with the Celestron Origin Mark II: 17 min from Bortle 6
All telescopes for the Flame Nebula · All targets for the DWARF 3