How long should I image the Eagle Nebula with the Vespera 3 from a Bortle 6 sky?

About 1 h 31 min of total integration for a solid image, or 6 h 03 min for a showpiece. A quick look takes 23 min.

How many subs is that on the Vespera 3?

At the default 10 s sub length, 545 subs for a solid image from Bortle 6 and 209 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 31 min to 58 min.

How long to image the Eagle Nebula with the Vaonis Vespera 3

From a Bortle 6 suburban sky, the Vaonis Vespera 3 needs about 1 h 31 min (545 subs of 10 s) for a solid image of the Eagle Nebula. A quick look takes 23 min; a showpiece 6 h 03 min. Under a Bortle 3 rural sky the solid figure drops to 35 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 fills 40% of the frame’s short side.

Eagle Nebula with the Vaonis Vespera 3: 10 s subs.
Sky	Quick lookTarget obvious, still noisy	SolidClean enough to share	ShowpieceSmooth faint detail, print-worthy
Bortle 1Excellent dark site	7 min44 subs	29 min176 subs	1 h 57 min702 subs
Bortle 2Typical dark site	8 min47 subs	31 min187 subs	2 h 04 min747 subs
Bortle 3Rural	9 min53 subs	35 min209 subs	2 h 19 min833 subs
Bortle 4Rural / suburban transition	11 min66 subs	43 min261 subs	2 h 53 min1,041 subs
Bortle 5Suburban	14 min86 subs	57 min343 subs	3 h 48 min1,371 subs
Bortle 6Bright suburban	23 min137 subs	1 h 31 min545 subs	6 h 03 min2,180 subs
Bortle 7Suburban / urban transition	39 min233 subs	2 h 35 min931 subs	10 h3,721 subs
Bortle 8City	1 h 04 min383 subs	4 h 15 min1,529 subs	17 h6,114 subs
Bortle 9Inner city	1 h 57 min702 subs	7 h 47 min2,805 subs	31 h11,219 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 1 h 58 min of run time. The Vespera 3’s battery (rated about 11 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 20000mAh 30WVaonis says an external bank extends sessions; 30 W PD as for the II and Pro.
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How it frames

The Eagle Nebula is 35′ × 28′ across. The Vespera 3 frames 2.60° × 1.46° at 2.44″ per pixel, so it fills 40% of the frame’s short side.

Longer subs

10 s subs by default; Expert Mode manual targets allow 1 to 30 s. Alt-azimuth only; CovalENS mosaic widens the field to 4.3° × 2.4°. Time for a solid image by sub length:

Sub length	Bortle 3	Bortle 5	Bortle 7
10 s	35 min209 subs	57 min343 subs	2 h 35 min931 subs
20 s	30 min89 subs	52 min157 subs	2 h 30 min450 subs
30 s	28 min56 subs	50 min101 subs	2 h 28 min297 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	35 min209 subs	57 min343 subs	2 h 35 min931 subs
dual-band (Dual Band filter), clip-on	40 min243 subs	47 min284 subs	1 h 17 min464 subs

The Vespera 3 has no built-in dual-band filter. Optional clip-on Vaonis filters: dual-band, light-pollution (CLS) and solar. The new optical baffle is not a substitute for a CLS filter. On an emission target like this it is the single biggest upgrade you can make.

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 Vaonis Vespera 3

The 2026 Vespera: same 50 mm quadruplet class as the II on an 8 MP IMX585, with a 24 MP mosaic mode and 11 hours of battery. Per pixel it behaves like a Seestar S50 Pro without the built-in dual-band filter.

10 s subs by default; Expert Mode manual targets allow 1 to 30 s. Alt-azimuth only; CovalENS mosaic widens the field to 4.3° × 2.4°. Optional clip-on Vaonis filters: dual-band, light-pollution (CLS) and solar. The new optical baffle is not a substitute for a CLS 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 Eagle Nebula with your Vespera 3? Did the solid figure match?Anonymous, one tap. It is how the model gets calibrated.

Have an image of the Eagle Nebula from a Vespera 3? 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 Vespera 3