How long to image the M69 with the Vaonis Vespera Pro 2
From a Bortle 6 suburban sky, the Vaonis Vespera Pro 2 needs about 36 min (214 subs of 10 s) for a solid image of the M69. A quick look takes 9 min; a showpiece 2 h 22 min. Under a Bortle 3 rural sky the solid figure drops to 18 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 10% 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 | 4 min25 subs | 16 min98 subs | 1 h 05 min392 subs |
| Bortle 2Typical dark site | 4 min26 subs | 17 min102 subs | 1 h 08 min406 subs |
| Bortle 3Rural | 5 min28 subs | 18 min109 subs | 1 h 12 min433 subs |
| Bortle 4Rural / suburban transition | 5 min32 subs | 21 min125 subs | 1 h 23 min498 subs |
| Bortle 5Suburban | 6 min38 subs | 25 min151 subs | 1 h 40 min601 subs |
| Bortle 6Bright suburban | 9 min54 subs | 36 min214 subs | 2 h 22 min854 subs |
| Bortle 7Suburban / urban transition | 14 min84 subs | 56 min334 subs | 3 h 43 min1,336 subs |
| Bortle 8City | 22 min131 subs | 1 h 27 min522 subs | 5 h 47 min2,085 subs |
| Bortle 9Inner city | 38 min231 subs | 2 h 33 min921 subs | 10 h3,681 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 46 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.
- red LED head torchRed light keeps your night vision; white light costs you twenty minutes of dark adaptation every time.
Affiliate links: the retailer pays us a small commission and you pay the same price. These are search links to the named product, not endorsements of a particular listing; check the listing matches your model.
Everything that fits the Vespera Pro 2 →
How it frames
The M69 is 9.8′ across. The Vespera Pro 2 frames 1.65° × 1.65° at 1.68″ per pixel, so it fills 10% 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 | 18 min109 subs | 25 min151 subs | 56 min334 subs |
| 20 s | 16 min48 subs | 23 min69 subs | 54 min161 subs |
| 30 s | 15 min31 subs | 22 min45 subs | 53 min106 subs |
About the M69
A small, metal-rich globular near the Sagittarius teapot's base. Low from the north.
NGC 6637 · Globular cluster in Sagittarius · magnitude 7.6 · 9.8′ · best in Jun, Jul, Aug. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.
Globular clusters are point sources packed tight, so they come quickly: the core resolves into stars within a handful of minutes on any smart scope. More time deepens the halo and pulls in the faint outer members. Use short subs so the core does not saturate into a white blob, and no filter.
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.
Have an image of the M69 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
- M69 with the ZWO Seestar S50: 17 min from Bortle 6
- M69 with the ZWO Seestar S50 Pro: 18 min from Bortle 6
- M69 with the ZWO Seestar S30: 18 min from Bortle 6
- M69 with the ZWO Seestar S30 Pro: 19 min from Bortle 6
- M69 with the DwarfLab DWARF 3: 25 min from Bortle 6
- M69 with the DwarfLab DWARF mini: 17 min from Bortle 6
- M69 with the DwarfLab Draco: 15 min from Bortle 6
- M69 with the DwarfLab DWARF II: 56 min from Bortle 6
- M69 with the Vaonis Vespera II: 17 min from Bortle 6
- M69 with the Vaonis Vespera Pro: 37 min from Bortle 6
- M69 with the Vaonis Vespera 3: 16 min from Bortle 6
- M69 with the Unistellar eQuinox 2: 15 min from Bortle 6
- M69 with the Unistellar Odyssey: 1 h 05 min from Bortle 6
- M69 with the Celestron Origin: 5 min from Bortle 6
- M69 with the Celestron Origin Mark II: 6 min from Bortle 6
All telescopes for the M69 · All targets for the Vespera Pro 2