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

About 2 h 21 min of total integration for a solid image, or 9 h 26 min for a showpiece. A quick look takes 35 min.

How many subs is that on the Vespera 3?

At the default 10 s sub length, 849 subs for a solid image from Bortle 6 and 315 from Bortle 3.

Does a dual-band filter help on the Western Veil Nebula?

Yes. It is an emission-line object; from Bortle 6 the filter cuts the solid-image time from 2 h 21 min to 1 h 28 min.

How long to image the Western Veil Nebula with the Vaonis Vespera 3

From a Bortle 6 suburban sky, the Vaonis Vespera 3 needs about 2 h 21 min (849 subs of 10 s) for a solid image of the Western Veil Nebula. A quick look takes 35 min; a showpiece 9 h 26 min. Under a Bortle 3 rural sky the solid figure drops to 52 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 80% of the frame’s short side.

Western Veil 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	11 min66 subs	44 min263 subs	2 h 55 min1,051 subs
Bortle 2Typical dark site	12 min71 subs	47 min281 subs	3 h 07 min1,123 subs
Bortle 3Rural	13 min79 subs	52 min315 subs	3 h 30 min1,259 subs
Bortle 4Rural / suburban transition	17 min100 subs	1 h 06 min398 subs	4 h 25 min1,589 subs
Bortle 5Suburban	22 min132 subs	1 h 28 min528 subs	5 h 52 min2,112 subs
Bortle 6Bright suburban	35 min213 subs	2 h 21 min849 subs	9 h 26 min3,394 subs
Bortle 7Suburban / urban transition	1 h 01 min365 subs	4 h 03 min1,460 subs	16 h5,837 subs
Bortle 8City	1 h 40 min602 subs	6 h 41 min2,408 subs	27 h9,630 subs
Bortle 9Inner city	3 h 05 min1,108 subs	12 h4,430 subs	49 h17,719 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 3 h 04 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 Western Veil Nebula is 70′ × 6′ across. The Vespera 3 frames 2.60° × 1.46° at 2.44″ per pixel, so it fills 80% 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; 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	52 min315 subs	1 h 28 min528 subs	4 h 03 min1,460 subs
20 s	44 min134 subs	1 h 20 min240 subs	3 h 55 min706 subs
30 s	42 min84 subs	1 h 17 min155 subs	3 h 53 min466 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	52 min315 subs	1 h 28 min528 subs	4 h 03 min1,460 subs
dual-band (Dual Band filter), clip-on	1 h362 subs	1 h 11 min428 subs	1 h 59 min713 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 Western Veil Nebula

A thin, bright filament of supernova shock running through the star 52 Cygni. A dual-band filter transforms it; without one it drowns in suburban skyglow.

NGC 6960, Witch’s Broom, Caldwell 34 · Supernova remnant in Cygnus · magnitude 7.0 · 70′ × 6′ · best in Jul, Aug, Sep. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.

Supernova remnants are emission-line objects, strong in both hydrogen-alpha and OIII, and their filaments are thin, so pixel scale matters as much as aperture. A dual-band filter is essential from any lit sky and still helps under a dark one. These are long-integration targets; plan on several sessions and stack across nights.

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.

Where to buy the Vespera 3Vaonis 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 Western Veil 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 Western Veil 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 Western Veil Nebula · All targets for the Vespera 3