How long to image the Carina Nebula with the DwarfLab DWARF mini
From a Bortle 6 suburban sky, the DwarfLab DWARF mini needs about 9 min (37 subs of 15 s with the built-in dual-band filter) for a solid image of the Carina Nebula. A quick look takes 3 min; a showpiece 37 min. Under a Bortle 3 rural sky the solid figure drops to 8 min. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it is 1.7× wider than the frame.
| Sky | Quick lookTarget obvious, still noisy | SolidClean enough to share | ShowpieceSmooth faint detail, print-worthy |
|---|---|---|---|
| Bortle 1Excellent dark site | 3 min10 subs | 8 min30 subs | 28 min112 subs |
| Bortle 2Typical dark site | 3 min10 subs | 8 min30 subs | 28 min113 subs |
| Bortle 3Rural | 3 min10 subs | 8 min30 subs | 29 min115 subs |
| Bortle 4Rural / suburban transition | 3 min10 subs | 8 min30 subs | 30 min120 subs |
| Bortle 5Suburban | 3 min10 subs | 8 min32 subs | 32 min128 subs |
| Bortle 6Bright suburban | 3 min10 subs | 9 min37 subs | 37 min147 subs |
| Bortle 7Suburban / urban transition | 3 min12 subs | 11 min46 subs | 46 min183 subs |
| Bortle 8City | 4 min15 subs | 15 min60 subs | 1 h239 subs |
| Bortle 9Inner city | 6 min23 subs | 22 min90 subs | 1 h 29 min357 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 12 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.
Affiliate links: the retailer pays us a small commission and you pay the same price. These are search links to the named product, not endorsements of a particular listing; check the listing matches your model.
Everything that fits the DWARF mini →
How it frames
The Carina Nebula is 120′ across. The DWARF mini frames 2.13° × 1.20° at 3.99″ per pixel, so it is 1.7× wider than the frame. A mosaic, or choosing the part you want and letting the rest go, is how it gets shot on this scope.
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 | 8 min30 subs | 8 min32 subs | 11 min46 subs |
| 30 s | 15 min30 subs | 15 min30 subs | 15 min30 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) | 8 min30 subs | 8 min34 subs | 20 min79 subs |
| dual-band | 8 min30 subs | 8 min32 subs | 11 min46 subs |
About the Carina Nebula
Four times the size and brightness of the Orion Nebula, the best emission nebula in the sky. Southern hemisphere only, and easy from anywhere it rises.
NGC 3372, Caldwell 92, Eta Carinae Nebula · Emission nebula in Carina · magnitude 1.0 · 120′ · best in Feb, Mar, Apr. Low or below the horizon from northern Europe; best from the southern US southwards.
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 Carina 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
- Carina Nebula with the ZWO Seestar S50: 9 min from Bortle 6
- Carina Nebula with the ZWO Seestar S50 Pro: 10 min from Bortle 6
- Carina Nebula with the ZWO Seestar S30: 10 min from Bortle 6
- Carina Nebula with the ZWO Seestar S30 Pro: 11 min from Bortle 6
- Carina Nebula with the DwarfLab DWARF 3: 12 min from Bortle 6
- Carina Nebula with the DwarfLab Draco: 15 min from Bortle 6
- Carina Nebula with the DwarfLab DWARF II: 41 min from Bortle 6
- Carina Nebula with the Vaonis Vespera II: 12 min from Bortle 6
- Carina Nebula with the Vaonis Vespera Pro: 27 min from Bortle 6
- Carina Nebula with the Vaonis Vespera 3: 12 min from Bortle 6
- Carina Nebula with the Vaonis Vespera Pro 2: 26 min from Bortle 6
- Carina Nebula with the Unistellar eQuinox 2: 11 min from Bortle 6
- Carina Nebula with the Unistellar Odyssey: 48 min from Bortle 6
- Carina Nebula with the Celestron Origin: 5 min from Bortle 6
- Carina Nebula with the Celestron Origin Mark II: 5 min from Bortle 6
All telescopes for the Carina Nebula · All targets for the DWARF mini