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

About 27 min of total integration for a solid image, or 1 h 48 min for a showpiece. A quick look takes 7 min.

How many subs is that on the Vespera Pro?

At the default 10 s sub length, 163 subs for a solid image from Bortle 6 and 82 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 27 min to 22 min.

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

From a Bortle 6 suburban sky, the Vaonis Vespera Pro needs about 27 min (163 subs of 10 s) for a solid image of the Carina Nebula. A quick look takes 7 min; a showpiece 1 h 48 min. Under a Bortle 3 rural sky the solid figure drops to 14 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 1.2×.

Carina Nebula with the Vaonis Vespera Pro: 10 s subs.
Sky	Quick lookTarget obvious, still noisy	SolidClean enough to share	ShowpieceSmooth faint detail, print-worthy
Bortle 1Excellent dark site	3 min19 subs	12 min74 subs	49 min296 subs
Bortle 2Typical dark site	3 min20 subs	13 min77 subs	51 min307 subs
Bortle 3Rural	3 min21 subs	14 min82 subs	55 min328 subs
Bortle 4Rural / suburban transition	4 min24 subs	16 min95 subs	1 h 03 min378 subs
Bortle 5Suburban	5 min29 subs	19 min115 subs	1 h 16 min457 subs
Bortle 6Bright suburban	7 min41 subs	27 min163 subs	1 h 48 min651 subs
Bortle 7Suburban / urban transition	11 min64 subs	43 min256 subs	2 h 50 min1,021 subs
Bortle 8City	17 min100 subs	1 h 06 min399 subs	4 h 26 min1,596 subs
Bortle 9Inner city	29 min177 subs	1 h 58 min706 subs	7 h 50 min2,821 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 35 min of run time. The Vespera Pro’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 30WExtends the 11 h battery; 30 W PD per Vaonis.
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How it frames

The Carina Nebula is 120′ across. The Vespera Pro frames 1.62° × 1.62° at 1.65″ per pixel, so it is just over the frame at 1.2×. 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, no EQ mode. Time for a solid image by sub length:

Sub length	Bortle 3	Bortle 5	Bortle 7
10 s	14 min82 subs	19 min115 subs	43 min256 subs
20 s	12 min36 subs	17 min52 subs	41 min123 subs
30 s	15 min30 subs	17 min34 subs	40 min81 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	14 min82 subs	19 min115 subs	43 min256 subs
dual-band (Dual Band filter), clip-on	18 min110 subs	20 min120 subs	27 min163 subs

The Vespera Pro has no built-in dual-band filter. Optional clip-on Vaonis filters: dual-band, light-pollution (CLS) and solar. 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 Pro

The square-sensor Vespera with 2 µm pixels. Higher resolution than the II, and correspondingly slower per pixel: expect around double the time for the same per-pixel SNR. Run-out in 2026 and replaced by the Vespera Pro 2.

10 s subs by default; Expert Mode manual targets allow 1 to 30 s. Alt-azimuth only, no EQ mode. Optional clip-on Vaonis filters: dual-band, light-pollution (CLS) and solar.

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 Pro? 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 Pro? 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 Pro