How long should I image the Lagoon Nebula with the Origin from a Bortle 6 sky?

About 7 min of total integration for a solid image, or 30 min for a showpiece. A quick look takes 2 min.

How many subs is that on the Origin?

At the default 10 s sub length, 45 subs for a solid image from Bortle 6 and 30 from Bortle 3.

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

Yes. It is an emission-line object; from Bortle 6 the filter cuts the solid-image time from 7 min to 5 min.

How long to image the Lagoon Nebula with the Celestron Origin

From a Bortle 6 suburban sky, the Celestron Origin needs about 7 min (45 subs of 10 s) for a solid image of the Lagoon Nebula. A quick look takes 2 min; a showpiece 30 min. Under a Bortle 3 rural sky the solid figure drops to 5 min. At Bortle 6 the limit is skyglow, so a darker site or a filter helps more than longer subs. In this scope's field it is 1.8× wider than the frame.

Lagoon Nebula with the Celestron Origin: 10 s subs.
Sky	Quick lookTarget obvious, still noisy	SolidClean enough to share	ShowpieceSmooth faint detail, print-worthy
Bortle 1Excellent dark site	2 min10 subs	5 min30 subs	15 min90 subs
Bortle 2Typical dark site	2 min10 subs	5 min30 subs	15 min90 subs
Bortle 3Rural	2 min10 subs	5 min30 subs	15 min90 subs
Bortle 4Rural / suburban transition	2 min10 subs	5 min30 subs	15 min90 subs
Bortle 5Suburban	2 min10 subs	5 min30 subs	19 min115 subs
Bortle 6Bright suburban	2 min12 subs	7 min45 subs	30 min180 subs
Bortle 7Suburban / urban transition	3 min20 subs	13 min77 subs	51 min306 subs
Bortle 8City	5 min32 subs	21 min126 subs	1 h 23 min501 subs
Bortle 9Inner city	10 min58 subs	38 min229 subs	2 h 33 min916 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 10 min of run time. The Origin’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.)

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How it frames

The Lagoon Nebula is 90′ × 40′ across. The Origin frames 1.27° × 0.85° at 1.48″ per pixel, so it is 1.8× 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

10 s auto subs (15 s with the Nebula Filter); manual 1 to 30 s on the alt-az mount, longer only with the EQ wedge, and 60 s and up needs the StarSense Autoguider too. Time for a solid image by sub length:

Sub length	Bortle 3	Bortle 5	Bortle 7
10 s	5 min30 subs	5 min30 subs	13 min77 subs
15 s	8 min30 subs	8 min30 subs	13 min51 subs
30 s	15 min30 subs	15 min30 subs	15 min30 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	5 min30 subs	5 min30 subs	13 min77 subs
dual-band (Nebula Filter), drawer	5 min30 subs	5 min30 subs	6 min37 subs

The Origin has no built-in dual-band filter. Filter drawer takes 1.25-inch or 2-inch filters, including dual-band; Celestron sells an optional Nebula Filter. On an emission target like this it is the single biggest upgrade you can make.

About the Lagoon Nebula

The showpiece emission nebula of the summer Milky Way, bright enough to catch its core in minutes. Pair it with the Trifid in one wide frame.

M8, NGC 6523 · Emission nebula in Sagittarius · magnitude 6.0 · 90′ × 40′ · 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 Celestron Origin

The first-generation Origin: a 6-inch f/2.2 RASA in a smart package and the fastest system here by a wide margin. Superseded by the Mark II in late 2025 and no longer sold new; Celestron offers a camera upgrade to the Mark II sensor.

10 s auto subs (15 s with the Nebula Filter); manual 1 to 30 s on the alt-az mount, longer only with the EQ wedge, and 60 s and up needs the StarSense Autoguider too. Filter drawer takes 1.25-inch or 2-inch filters, including dual-band; Celestron sells an optional Nebula Filter.

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 30 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 Lagoon Nebula with your Origin? Did the solid figure match?Anonymous, one tap. It is how the model gets calibrated.

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

Same target, other telescopes

All telescopes for the Lagoon Nebula · All targets for the Origin