How long should I image the Eagle Nebula with the Seestar S50 from a Bortle 6 sky?

About 1 h 01 min of total integration for a solid image, or 4 h 04 min for a showpiece. A quick look takes 15 min.

How many subs is that on the Seestar S50?

At the default 10 s sub length, 366 subs for a solid image from Bortle 6 and 259 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 35 min to 1 h 01 min.

How long to image the Eagle Nebula with the ZWO Seestar S50

From a Bortle 6 suburban sky, the ZWO Seestar S50 needs about 1 h 01 min (366 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 15 min; a showpiece 4 h 04 min. Under a Bortle 3 rural sky the solid figure drops to 43 min. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it fills 81% of the frame’s short side.

Eagle Nebula with the ZWO Seestar S50: 10 s subs with the built-in dual-band (LP filter) filter.
Sky	Quick lookTarget obvious, still noisy	SolidClean enough to share	ShowpieceSmooth faint detail, print-worthy
Bortle 1Excellent dark site	10 min62 subs	41 min248 subs	2 h 45 min992 subs
Bortle 2Typical dark site	10 min63 subs	42 min252 subs	2 h 48 min1,007 subs
Bortle 3Rural	11 min65 subs	43 min259 subs	2 h 52 min1,034 subs
Bortle 4Rural / suburban transition	11 min69 subs	46 min275 subs	3 h 03 min1,100 subs
Bortle 5Suburban	13 min76 subs	50 min302 subs	3 h 21 min1,205 subs
Bortle 6Bright suburban	15 min92 subs	1 h 01 min366 subs	4 h 04 min1,463 subs
Bortle 7Suburban / urban transition	20 min123 subs	1 h 21 min489 subs	5 h 26 min1,954 subs
Bortle 8City	28 min170 subs	1 h 53 min680 subs	7 h 33 min2,717 subs
Bortle 9Inner city	45 min272 subs	3 h 01 min1,086 subs	12 h4,344 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 1 h 19 min of run time. The Seestar S50’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 20000mAh 5V 3AThe S50 draws 5 V 3 A over USB-C and runs while charging; no PD needed.
Amazon UK Amazon US
Seestar S50 dew shieldThe built-in heater copes with most nights; a shield helps in heavy dew and blocks stray light.
Amazon UK Amazon US
red LED head torchRed light keeps your night vision; white light costs you twenty minutes of dark adaptation every time.
Amazon UK Amazon US

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 Seestar S50 →

How it frames

The Eagle Nebula is 35′ × 28′ across. The Seestar S50 frames 1.28° × 0.72° at 2.39″ per pixel, so it fills 81% of the frame’s short side.

Longer subs

10, 20 and 30 s in Alt-Az; 60 s only in EQ mode (app 2.5 and later). Time for a solid image by sub length:

Sub length	Bortle 3	Bortle 5	Bortle 7
10 s	43 min259 subs	50 min302 subs	1 h 21 min489 subs
20 s	32 min96 subs	39 min118 subs	1 h 10 min211 subs
30 s	28 min57 subs	35 min71 subs	1 h 07 min134 subs
60 s	30 min30 subs	32 min32 subs	1 h 03 min63 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
UV/IR-cut (no light-pollution filter)	37 min220 subs	1 h360 subs	2 h 42 min972 subs
dual-band (LP filter)	43 min259 subs	50 min302 subs	1 h 21 min489 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 S50

The scope that made smart astrophotography mainstream. 50 mm triplet, 2 MP sensor, dual-band filter on a wheel. Alt-Az stacking at 10 s, EQ mode unlocks 60 s. Out of production since 2026 and replaced by the S50 Pro, but there are a great many in use.

10, 20 and 30 s in Alt-Az; 60 s only in EQ mode (app 2.5 and later). Built-in dual-band light-pollution filter, switchable in the app.

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.

Where to buy the Seestar S50ZWO store Direct Amazon UK Amazon USThe ZWO store link is a plain link; the others are affiliate links. As an Amazon Associate I earn from qualifying purchases, at no cost to you.

Imaged the Eagle Nebula with your Seestar S50? Did the solid figure match?Anonymous, one tap. It is how the model gets calibrated.

Have an image of the Eagle Nebula from a Seestar S50? 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 Seestar S50