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

About 12 min of total integration for a solid image, or 47 min for a showpiece. A quick look takes 3 min.

How many subs is that on the Vespera 3?

At the default 10 s sub length, 71 subs for a solid image from Bortle 6 and 34 from Bortle 3.

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

Yes. It is an emission-line object; from Bortle 6 the filter cuts the solid-image time from 12 min to 9 min.

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

From a Bortle 6 suburban sky, the Vaonis Vespera 3 needs about 12 min (71 subs of 10 s) for a solid image of the Carina Nebula. A quick look takes 3 min; a showpiece 47 min. Under a Bortle 3 rural sky the solid figure drops to 6 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 just over the frame at 1.4×.

Carina 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	2 min10 subs	5 min30 subs	20 min119 subs
Bortle 2Typical dark site	2 min10 subs	5 min31 subs	21 min124 subs
Bortle 3Rural	2 min10 subs	6 min34 subs	22 min133 subs
Bortle 4Rural / suburban transition	2 min10 subs	6 min39 subs	26 min156 subs
Bortle 5Suburban	2 min12 subs	8 min48 subs	32 min192 subs
Bortle 6Bright suburban	3 min18 subs	12 min71 subs	47 min281 subs
Bortle 7Suburban / urban transition	5 min29 subs	19 min113 subs	1 h 15 min450 subs
Bortle 8City	7 min45 subs	30 min178 subs	1 h 59 min712 subs
Bortle 9Inner city	13 min80 subs	53 min318 subs	3 h 32 min1,272 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 15 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 Carina Nebula is 120′ across. The Vespera 3 frames 2.60° × 1.46° at 2.44″ per pixel, so it is just over the frame at 1.4×. Point at the part you want; the edges will fall outside the frame.

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	6 min34 subs	8 min48 subs	19 min113 subs
20 s	10 min30 subs	10 min30 subs	18 min55 subs
30 s	15 min30 subs	15 min30 subs	18 min36 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	6 min34 subs	8 min48 subs	19 min113 subs
dual-band (Dual Band filter), clip-on	7 min42 subs	8 min46 subs	11 min66 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 Carina Nebula

Four times the size and brightness of the Orion Nebula, the best emission nebula in the sky. Southern hemisphere only, and easy from anywhere it rises.

NGC 3372, Caldwell 92, Eta Carinae Nebula · Emission nebula in Carina · magnitude 1.0 · 120′ · best in Feb, Mar, Apr. Low or below the horizon from northern Europe; best from the southern US southwards.

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 Carina 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 Carina 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 Carina Nebula · All targets for the Vespera 3