How long should I image the Carina Nebula with the Vespera Pro 2 from a Bortle 6 sky?

About 26 min of total integration for a solid image, or 1 h 43 min for a showpiece. A quick look takes 6 min.

How many subs is that on the Vespera Pro 2?

At the default 10 s sub length, 156 subs for a solid image from Bortle 6 and 78 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 26 min to 21 min.

How long to image the Carina Nebula with the Vaonis Vespera Pro 2

From a Bortle 6 suburban sky, the Vaonis Vespera Pro 2 needs about 26 min (156 subs of 10 s) for a solid image of the Carina Nebula. A quick look takes 6 min; a showpiece 1 h 43 min. Under a Bortle 3 rural sky the solid figure drops to 13 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 2: 10 s subs.
Sky	Quick lookTarget obvious, still noisy	SolidClean enough to share	ShowpieceSmooth faint detail, print-worthy
Bortle 1Excellent dark site	3 min18 subs	12 min71 subs	47 min281 subs
Bortle 2Typical dark site	3 min19 subs	12 min73 subs	48 min291 subs
Bortle 3Rural	3 min20 subs	13 min78 subs	52 min311 subs
Bortle 4Rural / suburban transition	4 min23 subs	15 min90 subs	1 h359 subs
Bortle 5Suburban	5 min28 subs	18 min109 subs	1 h 12 min435 subs
Bortle 6Bright suburban	6 min39 subs	26 min156 subs	1 h 43 min621 subs
Bortle 7Suburban / urban transition	10 min62 subs	41 min245 subs	2 h 43 min977 subs
Bortle 8City	16 min96 subs	1 h 04 min382 subs	4 h 15 min1,528 subs
Bortle 9Inner city	28 min170 subs	1 h 53 min677 subs	7 h 31 min2,705 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 34 min of run time. The Vespera Pro 2’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 30WExternal bank extends the 11 h battery.
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red LED head torchRed light keeps your night vision; white light costs you twenty minutes of dark adaptation every time.
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How it frames

The Carina Nebula is 120′ across. The Vespera Pro 2 frames 1.65° × 1.65° at 1.68″ 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; CovalENS mosaic gives 3.2° × 3.2° at 50 MP. Time for a solid image by sub length:

Sub length	Bortle 3	Bortle 5	Bortle 7
10 s	13 min78 subs	18 min109 subs	41 min245 subs
20 s	11 min35 subs	17 min50 subs	39 min118 subs
30 s	15 min30 subs	16 min33 subs	39 min78 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	13 min78 subs	18 min109 subs	41 min245 subs
dual-band (Dual Band filter), clip-on	17 min103 subs	19 min113 subs	26 min154 subs

The Vespera Pro 2 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 2

The square-sensor 2026 Vespera with 2 µm pixels. Sharper than the Vespera 3 on small targets and correspondingly slower per pixel; the 12.5 MP square frame suits galaxies and planetaries.

10 s subs by default; Expert Mode manual targets allow 1 to 30 s. Alt-azimuth only; CovalENS mosaic gives 3.2° × 3.2° at 50 MP. 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.

Where to buy the Vespera Pro 2Vaonis store Direct Amazon UK Amazon USThe Vaonis 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 Carina Nebula with your Vespera Pro 2? 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 2? 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 2