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

About 4 h 25 min of total integration for a solid image, or 18 h for a showpiece. A quick look takes 1 h 06 min.

How many subs is that on the Vespera Pro 2?

At the default 10 s sub length, 1,589 subs for a solid image from Bortle 6 and 656 from Bortle 3.

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

Yes. It is an emission-line object; from Bortle 6 the filter cuts the solid-image time from 4 h 25 min to 3 h 08 min.

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

From a Bortle 6 suburban sky, the Vaonis Vespera Pro 2 needs about 4 h 25 min (1,589 subs of 10 s) for a solid image of the Eastern Veil Nebula. A quick look takes 1 h 06 min; a showpiece 18 h. Under a Bortle 3 rural sky the solid figure drops to 1 h 49 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 60% of the frame’s short side.

Eastern 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	24 min142 subs	1 h 34 min565 subs	6 h 16 min2,257 subs
Bortle 2Typical dark site	25 min149 subs	1 h 39 min596 subs	6 h 37 min2,383 subs
Bortle 3Rural	27 min164 subs	1 h 49 min656 subs	7 h 17 min2,621 subs
Bortle 4Rural / suburban transition	33 min200 subs	2 h 13 min800 subs	8 h 53 min3,198 subs
Bortle 5Suburban	43 min257 subs	2 h 51 min1,028 subs	11 h4,112 subs
Bortle 6Bright suburban	1 h 06 min398 subs	4 h 25 min1,589 subs	18 h6,354 subs
Bortle 7Suburban / urban transition	1 h 51 min665 subs	7 h 23 min2,657 subs	30 h10,626 subs
Bortle 8City	3 h1,079 subs	12 h4,315 subs	48 h17,259 subs
Bortle 9Inner city	5 h 27 min1,963 subs	22 h7,852 subs	87 h31,406 subs

Adjust in the calculator

Power and kit for this session

Allowing for slewing, focusing and rejected subs, that is about 5 h 44 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 Eastern Veil Nebula is 60′ × 8′ across. The Vespera Pro 2 frames 1.65° × 1.65° at 1.68″ per pixel, so it fills 60% 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	1 h 49 min656 subs	2 h 51 min1,028 subs	7 h 23 min2,657 subs
20 s	1 h 30 min272 subs	2 h 32 min458 subs	7 h 04 min1,272 subs
30 s	1 h 24 min169 subs	2 h 26 min293 subs	6 h 58 min836 subs

With and without the dual-band filter

Solid quality, default sub length.
Filter	Bortle 3	Bortle 5	Bortle 7
No filter	1 h 49 min656 subs	2 h 51 min1,028 subs	7 h 23 min2,657 subs
dual-band (Dual Band filter), clip-on	2 h 20 min841 subs	2 h 39 min955 subs	4 h 02 min1,454 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 Eastern Veil Nebula

The brighter, more detailed arc of the Veil. Red hydrogen and teal oxygen filaments interleave; dual-band captures both.

NGC 6992, NGC 6995, Caldwell 33 · Supernova remnant in Cygnus · magnitude 7.0 · 60′ × 8′ · 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.

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Imaged the Eastern 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 Eastern 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 Eastern Veil Nebula · All targets for the Vespera Pro 2