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

About 5 h 32 min of total integration for a solid image, or 22 h for a showpiece. A quick look takes 1 h 23 min.

How many subs is that on the Vespera Pro?

At the default 10 s sub length, 1,992 subs for a solid image from Bortle 6 and 824 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 5 h 32 min to 3 h 57 min.

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

From a Bortle 6 suburban sky, the Vaonis Vespera Pro needs about 5 h 32 min (1,992 subs of 10 s) for a solid image of the Western Veil Nebula. A quick look takes 1 h 23 min; a showpiece 22 h. Under a Bortle 3 rural sky the solid figure drops to 2 h 17 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 72% of the frame’s short side.

Western Veil 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	30 min178 subs	1 h 58 min710 subs	7 h 53 min2,837 subs
Bortle 2Typical dark site	31 min188 subs	2 h 05 min749 subs	8 h 19 min2,995 subs
Bortle 3Rural	34 min206 subs	2 h 17 min824 subs	9 h 09 min3,293 subs
Bortle 4Rural / suburban transition	42 min251 subs	2 h 47 min1,004 subs	11 h4,015 subs
Bortle 5Suburban	54 min323 subs	3 h 35 min1,290 subs	14 h5,158 subs
Bortle 6Bright suburban	1 h 23 min498 subs	5 h 32 min1,992 subs	22 h7,965 subs
Bortle 7Suburban / urban transition	2 h 19 min833 subs	9 h 15 min3,329 subs	37 h13,313 subs
Bortle 8City	3 h 45 min1,352 subs	15 h5,405 subs	60 h21,617 subs
Bortle 9Inner city	6 h 50 min2,458 subs	27 h9,832 subs	110+ h39,326 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 7 h 11 min of run time. That is more than one night: over 2 nights, about 3 h 36 min each. The Vespera Pro’s battery (rated about 11 h) should cover each night; a power bank still keeps the phone running the app alive. (Bortle 6, solid image; we allow 30% over the integration time.)

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How it frames

The Western Veil Nebula is 70′ × 6′ across. The Vespera Pro frames 1.62° × 1.62° at 1.65″ per pixel, so it fills 72% 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	2 h 17 min824 subs	3 h 35 min1,290 subs	9 h 15 min3,329 subs
20 s	1 h 53 min339 subs	3 h 10 min572 subs	8 h 50 min1,591 subs
30 s	1 h 45 min210 subs	3 h 02 min365 subs	8 h 42 min1,045 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	2 h 17 min824 subs	3 h 35 min1,290 subs	9 h 15 min3,329 subs
dual-band (Dual Band filter), clip-on	2 h 58 min1,066 subs	3 h 21 min1,209 subs	5 h 05 min1,833 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 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 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 Western Veil 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 Western Veil 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 Western Veil Nebula · All targets for the Vespera Pro