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

About 5 h 16 min of total integration for a solid image, or 21 h for a showpiece. A quick look takes 1 h 19 min.

How many subs is that on the Vespera Pro 2?

At the default 10 s sub length, 1,898 subs for a solid image from Bortle 6 and 776 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 16 min to 3 h 43 min.

How long to image the Western Veil Nebula with the Vaonis Vespera Pro 2

From a Bortle 6 suburban sky, the Vaonis Vespera Pro 2 needs about 5 h 16 min (1,898 subs of 10 s) for a solid image of the Western Veil Nebula. A quick look takes 1 h 19 min; a showpiece 21 h. Under a Bortle 3 rural sky the solid figure drops to 2 h 09 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 71% of the frame’s short side.

Western Veil 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	28 min167 subs	1 h 51 min667 subs	7 h 24 min2,666 subs
Bortle 2Typical dark site	29 min177 subs	1 h 57 min705 subs	7 h 50 min2,818 subs
Bortle 3Rural	32 min194 subs	2 h 09 min776 subs	8 h 37 min3,104 subs
Bortle 4Rural / suburban transition	40 min238 subs	2 h 38 min950 subs	11 h3,797 subs
Bortle 5Suburban	51 min306 subs	3 h 24 min1,224 subs	14 h4,896 subs
Bortle 6Bright suburban	1 h 19 min475 subs	5 h 16 min1,898 subs	21 h7,591 subs
Bortle 7Suburban / urban transition	2 h 13 min796 subs	8 h 50 min3,182 subs	35 h12,727 subs
Bortle 8City	3 h 36 min1,294 subs	14 h5,176 subs	58 h20,702 subs
Bortle 9Inner city	6 h 33 min2,357 subs	26 h9,428 subs	100+ h37,710 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 6 h 51 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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How it frames

The Western Veil Nebula is 70′ × 6′ across. The Vespera Pro 2 frames 1.65° × 1.65° at 1.68″ per pixel, so it fills 71% 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 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	2 h 09 min776 subs	3 h 24 min1,224 subs	8 h 50 min3,182 subs
20 s	1 h 47 min321 subs	3 h 01 min545 subs	8 h 28 min1,524 subs
30 s	1 h 39 min199 subs	2 h 54 min348 subs	8 h 20 min1,001 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	2 h 09 min776 subs	3 h 24 min1,224 subs	8 h 50 min3,182 subs
dual-band (Dual Band filter), clip-on	2 h 46 min994 subs	3 h 08 min1,131 subs	4 h 48 min1,731 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 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 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 Western Veil 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 Western Veil 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 Western Veil Nebula · All targets for the Vespera Pro 2