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

About 38 min of total integration for a solid image, or 2 h 31 min for a showpiece. A quick look takes 9 min.

How many subs is that on the Vespera Pro?

At the default 10 s sub length, 227 subs for a solid image from Bortle 6 and 111 from Bortle 3.

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

Yes. It is an emission-line object; from Bortle 6 the filter cuts the solid-image time from 38 min to 30 min.

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

From a Bortle 6 suburban sky, the Vaonis Vespera Pro needs about 38 min (227 subs of 10 s) for a solid image of the Orion Nebula. A quick look takes 9 min; a showpiece 2 h 31 min. Under a Bortle 3 rural sky the solid figure drops to 18 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 87% of the frame’s short side.

Orion 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	4 min25 subs	16 min99 subs	1 h 06 min395 subs
Bortle 2Typical dark site	4 min26 subs	17 min103 subs	1 h 08 min411 subs
Bortle 3Rural	5 min28 subs	18 min111 subs	1 h 13 min441 subs
Bortle 4Rural / suburban transition	5 min33 subs	21 min129 subs	1 h 25 min513 subs
Bortle 5Suburban	7 min40 subs	26 min157 subs	1 h 45 min628 subs
Bortle 6Bright suburban	9 min57 subs	38 min227 subs	2 h 31 min908 subs
Bortle 7Suburban / urban transition	15 min91 subs	1 h361 subs	4 h1,443 subs
Bortle 8City	24 min143 subs	1 h 35 min569 subs	6 h 19 min2,273 subs
Bortle 9Inner city	42 min253 subs	2 h 48 min1,011 subs	11 h4,044 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 49 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, and 30% off the battery for a December night.)

USB-C PD power bank 20000mAh 30WExtends the 11 h battery; 30 W PD per Vaonis.
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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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hand warmers long lastingAir-activated packs give hours of heat for the person; winter nights are long and you spend most of them standing still.
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How it frames

The Orion Nebula is 85′ × 60′ across. The Vespera Pro frames 1.62° × 1.62° at 1.65″ per pixel, so it fills 87% 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, no EQ mode. Time for a solid image by sub length:

Sub length	Bortle 3	Bortle 5	Bortle 7
10 s	18 min111 subs	26 min157 subs	1 h361 subs
20 s	16 min48 subs	24 min72 subs	58 min173 subs
30 s	15 min31 subs	23 min46 subs	57 min114 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	18 min111 subs	26 min157 subs	1 h361 subs
dual-band (Dual Band filter), clip-on	24 min147 subs	27 min161 subs	37 min223 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 Orion Nebula

The brightest nebula in the northern sky and the one every smart scope gets pointed at first. The core saturates in a minute; the wings and the Running Man need real time. Mix short and long stacks.

M42, NGC 1976 · Emission nebula in Orion · magnitude 4.0 · 85′ × 60′ · best in Nov, Dec, Jan. 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 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 Orion 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 Orion 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 Orion Nebula · All targets for the Vespera Pro