How long to image the Tadpoles Nebula with the DwarfLab DWARF 3
From a Bortle 6 suburban sky, the DwarfLab DWARF 3 needs about 2 h 55 min (700 subs of 15 s with the built-in dual-band filter) for a solid image of the Tadpoles Nebula. A quick look takes 44 min; a showpiece 12 h. Under a Bortle 3 rural sky the solid figure drops to 1 h 45 min. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it fills 40% 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 | 25 min99 subs | 1 h 39 min395 subs | 6 h 35 min1,580 subs |
| Bortle 2Typical dark site | 25 min102 subs | 1 h 41 min405 subs | 6 h 44 min1,617 subs |
| Bortle 3Rural | 26 min106 subs | 1 h 45 min422 subs | 7 h 02 min1,688 subs |
| Bortle 4Rural / suburban transition | 29 min117 subs | 1 h 56 min465 subs | 7 h 45 min1,860 subs |
| Bortle 5Suburban | 33 min134 subs | 2 h 13 min533 subs | 8 h 53 min2,131 subs |
| Bortle 6Bright suburban | 44 min175 subs | 2 h 55 min700 subs | 12 h2,798 subs |
| Bortle 7Suburban / urban transition | 1 h 04 min255 subs | 4 h 14 min1,018 subs | 17 h4,069 subs |
| Bortle 8City | 1 h 34 min378 subs | 6 h 18 min1,511 subs | 25 h6,043 subs |
| Bortle 9Inner city | 2 h 40 min641 subs | 11 h2,563 subs | 43 h10,251 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 3 h 47 min of run time. The DWARF 3’s battery is rated at about 5 h 30 min, less near freezing, which is cutting it fine; take a power bank. (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 Tadpoles Nebula is 40′ × 30′ across. The DWARF 3 frames 2.93° × 1.65° at 2.75″ per pixel, so it fills 40% 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 | 1 h 45 min422 subs | 2 h 13 min533 subs | 4 h 14 min1,018 subs |
| 30 s | 1 h 29 min179 subs | 1 h 57 min235 subs | 3 h 58 min477 subs |
| 60 s | 1 h 21 min82 subs | 1 h 49 min110 subs | 3 h 50 min231 subs |
With and without the dual-band filter
| Filter | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| Astro (no light-pollution filter) | 1 h 49 min435 subs | 3 h 19 min797 subs | 9 h 55 min2,379 subs |
| dual-band | 1 h 45 min422 subs | 2 h 13 min533 subs | 4 h 14 min1,018 subs |
About the Tadpoles Nebula
A hydrogen cloud around the cluster NGC 1893, with two tadpole-shaped pillars. Sits in a frame with the Flaming Star on a wide scope.
IC 410 · Emission nebula in Auriga · magnitude 7.5 · 40′ × 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 Tadpoles 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
- Tadpoles Nebula with the ZWO Seestar S50: 2 h 22 min from Bortle 6
- Tadpoles Nebula with the ZWO Seestar S50 Pro: 2 h 40 min from Bortle 6
- Tadpoles Nebula with the ZWO Seestar S30: 2 h 47 min from Bortle 6
- Tadpoles Nebula with the ZWO Seestar S30 Pro: 2 h 53 min from Bortle 6
- Tadpoles Nebula with the DwarfLab DWARF mini: 2 h 20 min from Bortle 6
- Tadpoles Nebula with the DwarfLab Draco: 1 h 52 min from Bortle 6
- Tadpoles Nebula with the DwarfLab DWARF II: 13 h from Bortle 6
- Tadpoles Nebula with the Vaonis Vespera II: 3 h 51 min from Bortle 6
- Tadpoles Nebula with the Vaonis Vespera Pro: 8 h 39 min from Bortle 6
- Tadpoles Nebula with the Vaonis Vespera 3: 3 h 41 min from Bortle 6
- Tadpoles Nebula with the Vaonis Vespera Pro 2: 8 h 15 min from Bortle 6
- Tadpoles Nebula with the Unistellar eQuinox 2: 3 h 32 min from Bortle 6
- Tadpoles Nebula with the Unistellar Odyssey: 16 h from Bortle 6
- Tadpoles Nebula with the Celestron Origin: 1 h 01 min from Bortle 6
- Tadpoles Nebula with the Celestron Origin Mark II: 1 h 24 min from Bortle 6
All telescopes for the Tadpoles Nebula · All targets for the DWARF 3