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

About 16 min of total integration for a solid image, or 1 h 05 min for a showpiece. A quick look takes 4 min.

How many subs is that on the Vespera 3?

At the default 10 s sub length, 98 subs for a solid image from Bortle 6 and 45 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 16 min to 12 min.

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

From a Bortle 6 suburban sky, the Vaonis Vespera 3 needs about 16 min (98 subs of 10 s) for a solid image of the Orion Nebula. A quick look takes 4 min; a showpiece 1 h 05 min. Under a Bortle 3 rural sky the solid figure drops to 7 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 only just fits, at 97% of the short side.

Orion 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	6 min39 subs	26 min156 subs
Bortle 2Typical dark site	2 min11 subs	7 min41 subs	27 min164 subs
Bortle 3Rural	2 min12 subs	7 min45 subs	29 min177 subs
Bortle 4Rural / suburban transition	2 min14 subs	9 min53 subs	35 min210 subs
Bortle 5Suburban	3 min17 subs	11 min66 subs	44 min262 subs
Bortle 6Bright suburban	4 min25 subs	16 min98 subs	1 h 05 min391 subs
Bortle 7Suburban / urban transition	7 min40 subs	26 min159 subs	1 h 46 min635 subs
Bortle 8City	11 min64 subs	42 min254 subs	2 h 49 min1,014 subs
Bortle 9Inner city	19 min114 subs	1 h 16 min456 subs	5 h 04 min1,823 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 21 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, and 30% off the battery for a December night.)

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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red LED head torchRed light keeps your night vision; white light costs you twenty minutes of dark adaptation every time.
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Everything that fits the Vespera 3 →

How it frames

The Orion Nebula is 85′ × 60′ across. The Vespera 3 frames 2.60° × 1.46° at 2.44″ per pixel, so it only just fits, at 97% of the short side. Centre it carefully: there is no room to crop back afterwards.

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	7 min45 subs	11 min66 subs	26 min159 subs
20 s	10 min30 subs	10 min31 subs	26 min77 subs
30 s	15 min30 subs	15 min30 subs	25 min51 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	7 min45 subs	11 min66 subs	26 min159 subs
dual-band (Dual Band filter), clip-on	9 min55 subs	10 min61 subs	15 min90 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 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 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 Orion 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 Orion 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 Orion Nebula · All targets for the Vespera 3