How long should I image the Eagle Nebula with the Draco from a Bortle 6 sky?

About 48 min of total integration for a solid image, or 3 h 13 min for a showpiece. A quick look takes 12 min.

How many subs is that on the Draco?

At the default 30 s sub length, 97 subs for a solid image from Bortle 6 and 67 from Bortle 3.

Does a dual-band filter help on the Eagle Nebula?

Yes. It is an emission-line object; from Bortle 6 the filter cuts the solid-image time from 1 h 18 min to 48 min.

How long to image the Eagle Nebula with the DwarfLab Draco

From a Bortle 6 suburban sky, the DwarfLab Draco needs about 48 min (97 subs of 30 s with the built-in dual-narrowband (Hα + OIII) filter) for a solid image of the Eagle Nebula. A quick look takes 12 min; a showpiece 3 h 13 min. Under a Bortle 3 rural sky the solid figure drops to 33 min. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it fills 47% of the frame’s short side.

Eagle Nebula with the DwarfLab Draco: 30 s subs with the built-in dual-narrowband (Hα + OIII) filter.
Sky	Quick lookTarget obvious, still noisy	SolidClean enough to share	ShowpieceSmooth faint detail, print-worthy
Bortle 1Excellent dark site	8 min16 subs	32 min64 subs	2 h 08 min256 subs
Bortle 2Typical dark site	8 min17 subs	32 min65 subs	2 h 10 min260 subs
Bortle 3Rural	8 min17 subs	33 min67 subs	2 h 14 min268 subs
Bortle 4Rural / suburban transition	9 min18 subs	36 min72 subs	2 h 23 min286 subs
Bortle 5Suburban	10 min20 subs	39 min79 subs	2 h 37 min315 subs
Bortle 6Bright suburban	12 min25 subs	48 min97 subs	3 h 13 min387 subs
Bortle 7Suburban / urban transition	16 min33 subs	1 h 05 min131 subs	4 h 22 min524 subs
Bortle 8City	23 min46 subs	1 h 32 min184 subs	6 h 08 min736 subs
Bortle 9Inner city	37 min75 subs	2 h 28 min297 subs	9 h 54 min1,188 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 1 h 03 min of run time. The Draco’s battery (rated about 5 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 PD power bank 20000mAhRated 5 h on its 10,000 mAh battery. DwarfLab has not published the charging input, so check PD support before relying on it mid-session.
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How it frames

The Eagle Nebula is 35′ × 28′ across. The Draco frames 1.66° × 1.24° at 1.46″ per pixel, so it fills 47% of the frame’s short side.

Longer subs

Auto Mode picks the exposure; Pro Mode allows up to 300 s, held by built-in guiding and field derotation. The 30 s default here is our assumption. Time for a solid image by sub length:

Sub length	Bortle 3	Bortle 5	Bortle 7
30 s	33 min67 subs	39 min79 subs	1 h 05 min131 subs
60 s	30 min30 subs	31 min31 subs	57 min58 subs
120 s	1 h30 subs	1 h30 subs	1 h30 subs
300 s	2 h 30 min30 subs	2 h 30 min30 subs	2 h 30 min30 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	29 min59 subs	49 min98 subs	2 h 14 min268 subs
dual-narrowband (Hα + OIII)	33 min67 subs	39 min79 subs	1 h 05 min131 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 DwarfLab Draco

DwarfLab’s big scope: 90 mm of folded f/3.8 optics, the most aperture of any Seestar or DWARF, a narrow 13 nm dual-band filter and 300 s subs with built-in guiding. A small-target scope; big nebulae need its mosaic mode.

Auto Mode picks the exposure; Pro Mode allows up to 300 s, held by built-in guiding and field derotation. The 30 s default here is our assumption. Built-in Hα + OIII dual-narrowband filter, 13 nm per line; the SHO Edition adds an SII option.

Longer subs matter most under dark skies, where read noise rather than skyglow sets the floor. From a city the difference between 30 s and 300 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.

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Imaged the Eagle Nebula with your Draco? Did the solid figure match?Anonymous, one tap. It is how the model gets calibrated.

Have an image of the Eagle Nebula from a Draco? Email it with your total time and sky to [email protected] and it goes here, credited.

Same target, other telescopes

All telescopes for the Eagle Nebula · All targets for the Draco