How long to image the Owl Nebula with the Vaonis Vespera Pro
From a Bortle 6 suburban sky, the Vaonis Vespera Pro needs about 1 h 59 min (716 subs of 10 s) for a solid image of the Owl Nebula. A quick look takes 30 min; a showpiece 7 h 57 min. Under a Bortle 3 rural sky the solid figure drops to 56 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 3% of the frame’s short side.
| Sky | Quick lookTarget obvious, still noisy | SolidClean enough to share | ShowpieceSmooth faint detail, print-worthy |
|---|---|---|---|
| Bortle 1Excellent dark site | 12 min75 subs | 50 min299 subs | 3 h 19 min1,196 subs |
| Bortle 2Typical dark site | 13 min78 subs | 52 min312 subs | 3 h 28 min1,247 subs |
| Bortle 3Rural | 14 min84 subs | 56 min336 subs | 3 h 44 min1,344 subs |
| Bortle 4Rural / suburban transition | 16 min99 subs | 1 h 06 min395 subs | 4 h 23 min1,579 subs |
| Bortle 5Suburban | 20 min122 subs | 1 h 21 min488 subs | 5 h 25 min1,951 subs |
| Bortle 6Bright suburban | 30 min179 subs | 1 h 59 min716 subs | 7 h 57 min2,864 subs |
| Bortle 7Suburban / urban transition | 48 min288 subs | 3 h 12 min1,151 subs | 13 h4,603 subs |
| Bortle 8City | 1 h 16 min457 subs | 5 h 04 min1,826 subs | 20 h7,303 subs |
| Bortle 9Inner city | 2 h 16 min817 subs | 9 h 04 min3,266 subs | 36 h13,063 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 2 h 35 min of run time. The Vespera Pro’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 30WExtends the 11 h battery; 30 W PD per Vaonis.
- red LED head torchRed light keeps your night vision; white light costs you twenty minutes of dark adaptation every time.
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How it frames
The Owl Nebula is 3.4′ × 3.3′ across. The Vespera Pro frames 1.62° × 1.62° at 1.65″ per pixel, so it fills 3% 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 | 56 min336 subs | 1 h 21 min488 subs | 3 h 12 min1,151 subs |
| 20 s | 48 min145 subs | 1 h 13 min220 subs | 3 h 04 min552 subs |
| 30 s | 45 min91 subs | 1 h 11 min142 subs | 3 h 01 min363 subs |
With and without the dual-band filter
| Filter | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| No filter | 56 min336 subs | 1 h 21 min488 subs | 3 h 12 min1,151 subs |
| dual-band (Dual Band filter), clip-on | 1 h 14 min445 subs | 1 h 22 min491 subs | 1 h 56 min694 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 Owl Nebula
A round planetary with two dark eyes. Large for its class and low in surface brightness; dual-band helps a lot.
M97, NGC 3587 · Planetary nebula in Ursa Major · magnitude 9.9 · 3.4′ × 3.3′ · best in Feb, Mar, Apr. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.
Planetary nebulae are small but intensely bright per pixel in OIII and H-alpha, so they respond very well to a dual-band filter and do not need much time for the main shell. The faint outer halos most of them have are a different proposition and need hours. Keep subs short if the central region saturates.
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.
Have an image of the Owl 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
- Owl Nebula with the ZWO Seestar S50: 38 min from Bortle 6
- Owl Nebula with the ZWO Seestar S50 Pro: 42 min from Bortle 6
- Owl Nebula with the ZWO Seestar S30: 43 min from Bortle 6
- Owl Nebula with the ZWO Seestar S30 Pro: 45 min from Bortle 6
- Owl Nebula with the DwarfLab DWARF 3: 49 min from Bortle 6
- Owl Nebula with the DwarfLab DWARF mini: 37 min from Bortle 6
- Owl Nebula with the DwarfLab Draco: 30 min from Bortle 6
- Owl Nebula with the DwarfLab DWARF II: 3 h from Bortle 6
- Owl Nebula with the Vaonis Vespera II: 54 min from Bortle 6
- Owl Nebula with the Vaonis Vespera 3: 51 min from Bortle 6
- Owl Nebula with the Vaonis Vespera Pro 2: 1 h 54 min from Bortle 6
- Owl Nebula with the Unistellar eQuinox 2: 47 min from Bortle 6
- Owl Nebula with the Unistellar Odyssey: 3 h 36 min from Bortle 6
- Owl Nebula with the Celestron Origin: 14 min from Bortle 6
- Owl Nebula with the Celestron Origin Mark II: 20 min from Bortle 6
All telescopes for the Owl Nebula · All targets for the Vespera Pro