How long to image the Eagle Nebula with the ZWO Seestar S30
From a Bortle 6 suburban sky, the ZWO Seestar S30 needs about 1 h 11 min (425 subs of 10 s with the built-in dual-band (LP filter) filter) for a solid image of the Eagle Nebula. A quick look takes 18 min; a showpiece 4 h 43 min. Under a Bortle 3 rural sky the solid figure drops to 53 min. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it fills 49% 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 | 13 min77 subs | 51 min307 subs | 3 h 25 min1,228 subs |
| Bortle 2Typical dark site | 13 min78 subs | 52 min311 subs | 3 h 27 min1,242 subs |
| Bortle 3Rural | 13 min80 subs | 53 min318 subs | 3 h 31 min1,269 subs |
| Bortle 4Rural / suburban transition | 14 min84 subs | 56 min334 subs | 3 h 43 min1,336 subs |
| Bortle 5Suburban | 15 min91 subs | 1 h361 subs | 4 h1,441 subs |
| Bortle 6Bright suburban | 18 min107 subs | 1 h 11 min425 subs | 4 h 43 min1,699 subs |
| Bortle 7Suburban / urban transition | 23 min137 subs | 1 h 31 min548 subs | 6 h 05 min2,190 subs |
| Bortle 8City | 31 min185 subs | 2 h 03 min739 subs | 8 h 12 min2,953 subs |
| Bortle 9Inner city | 48 min287 subs | 3 h 11 min1,145 subs | 13 h4,580 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 1 h 32 min of run time. The Seestar S30’s battery (rated about 6 h) 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 power bank 10000mAh 5V 3A6,000 mAh inside; a 10,000 mAh 5 V 3 A bank roughly doubles a session.
- Seestar S30 dew shieldHeater is built in; a cheap shield reduces dew and stray light.
- 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 Seestar S30 →
How it frames
The Eagle Nebula is 35′ × 28′ across. The Seestar S30 frames 2.13° × 1.20° at 3.99″ per pixel, so it fills 49% of the frame’s short side.
Longer subs
10, 20 and 30 s in Alt-Az; 60 s only in EQ mode, which needs the TH10 head. Time for a solid image by sub length:
| Sub length | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| 10 s | 53 min318 subs | 1 h361 subs | 1 h 31 min548 subs |
| 20 s | 37 min111 subs | 44 min132 subs | 1 h 15 min226 subs |
| 30 s | 31 min63 subs | 39 min78 subs | 1 h 10 min140 subs |
| 60 s | 30 min30 subs | 33 min34 subs | 1 h 04 min65 subs |
With and without the dual-band filter
| Filter | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| UV/IR-cut (no light-pollution filter) | 41 min249 subs | 1 h 05 min389 subs | 2 h 47 min1,001 subs |
| dual-band (LP filter) | 53 min318 subs | 1 h361 subs | 1 h 31 min548 subs |
About the Eagle Nebula
Home of the Pillars of Creation. The cluster comes fast; the pillars and surrounding nebulosity need a dual-band filter and patience.
M16, NGC 6611, IC 4703 · Emission nebula in Serpens · magnitude 6.0 · 35′ × 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 ZWO Seestar S30
Wider and lighter than the S50 with the same 2.9 µm pixels, so its per-pixel speed on extended targets is close despite the smaller aperture. Ideal for big nebulae.
10, 20 and 30 s in Alt-Az; 60 s only in EQ mode, which needs the TH10 head. Built-in UV/IR-cut, dual-band (OIII 30 nm / Hα 20 nm) and dark filters.
Longer subs matter most under dark skies, where read noise rather than skyglow sets the floor. From a city the difference between 10 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 Eagle Nebula from a Seestar S30? Email it with your total time and sky to [email protected] and it goes here, credited.
Same target, other telescopes
- Eagle Nebula with the ZWO Seestar S50: 1 h 01 min from Bortle 6
- Eagle Nebula with the ZWO Seestar S50 Pro: 1 h 08 min from Bortle 6
- Eagle Nebula with the ZWO Seestar S30 Pro: 1 h 14 min from Bortle 6
- Eagle Nebula with the DwarfLab DWARF 3: 1 h 16 min from Bortle 6
- Eagle Nebula with the DwarfLab DWARF mini: 1 h from Bortle 6
- Eagle Nebula with the DwarfLab Draco: 48 min from Bortle 6
- Eagle Nebula with the DwarfLab DWARF II: 5 h 25 min from Bortle 6
- Eagle Nebula with the Vaonis Vespera II: 1 h 35 min from Bortle 6
- Eagle Nebula with the Vaonis Vespera Pro: 3 h 33 min from Bortle 6
- Eagle Nebula with the Vaonis Vespera 3: 1 h 31 min from Bortle 6
- Eagle Nebula with the Vaonis Vespera Pro 2: 3 h 23 min from Bortle 6
- Eagle Nebula with the Unistellar eQuinox 2: 1 h 26 min from Bortle 6
- Eagle Nebula with the Unistellar Odyssey: 6 h 39 min from Bortle 6
- Eagle Nebula with the Celestron Origin: 25 min from Bortle 6
- Eagle Nebula with the Celestron Origin Mark II: 35 min from Bortle 6
All telescopes for the Eagle Nebula · All targets for the Seestar S30