How long to image the M106 with the Vaonis Vespera Pro 2
From a Bortle 6 suburban sky, the Vaonis Vespera Pro 2 needs about 2 h 19 min (832 subs of 10 s) for a solid image of the M106. A quick look takes 35 min; a showpiece 9 h 14 min. Under a Bortle 3 rural sky the solid figure drops to 59 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 19% 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 | 13 min78 subs | 52 min311 subs | 3 h 27 min1,241 subs |
| Bortle 2Typical dark site | 14 min82 subs | 54 min327 subs | 3 h 37 min1,305 subs |
| Bortle 3Rural | 15 min90 subs | 59 min357 subs | 3 h 58 min1,426 subs |
| Bortle 4Rural / suburban transition | 18 min108 subs | 1 h 12 min430 subs | 4 h 46 min1,719 subs |
| Bortle 5Suburban | 23 min137 subs | 1 h 31 min546 subs | 6 h 04 min2,184 subs |
| Bortle 6Bright suburban | 35 min208 subs | 2 h 19 min832 subs | 9 h 14 min3,325 subs |
| Bortle 7Suburban / urban transition | 57 min344 subs | 3 h 49 min1,375 subs | 15 h5,498 subs |
| Bortle 8City | 1 h 32 min555 subs | 6 h 10 min2,218 subs | 25 h8,872 subs |
| Bortle 9Inner city | 2 h 47 min1,005 subs | 11 h4,018 subs | 45 h16,069 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 3 h 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 M106 is 19′ × 8′ across. The Vespera Pro 2 frames 1.65° × 1.65° at 1.68″ per pixel, so it fills 19% 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 | 59 min357 subs | 1 h 31 min546 subs | 3 h 49 min1,375 subs |
| 20 s | 50 min150 subs | 1 h 21 min245 subs | 3 h 39 min659 subs |
| 30 s | 47 min94 subs | 1 h 18 min157 subs | 3 h 36 min433 subs |
About the M106
A big, bright spiral with anomalous red arms driven by its black hole. Dual-band brings the extra arms out.
NGC 4258 · Galaxy in Canes Venatici · magnitude 8.4 · 19′ × 8′ · best in Mar, Apr, May. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.
Galaxies are broadband targets: their light is mostly starlight spread across the spectrum, so a dual-band filter throws most of it away and makes things slower, not faster. Shoot without a filter (or with a plain UV/IR cut) and rely on total time and a dark sky. The core of a galaxy is usually many times brighter than its outer disc, so a short stack shows the nucleus long before the arms; the figures here are for the arms and disc, not the core.
Field rotation in Alt-Az mode crops the edges of the stack over a long session, so on a big galaxy re-centre now and then or use EQ mode where your scope supports it.
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 M106 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
- M106 with the ZWO Seestar S50: 1 h 05 min from Bortle 6
- M106 with the ZWO Seestar S50 Pro: 1 h 11 min from Bortle 6
- M106 with the ZWO Seestar S30: 1 h 08 min from Bortle 6
- M106 with the ZWO Seestar S30 Pro: 1 h 15 min from Bortle 6
- M106 with the DwarfLab DWARF 3: 1 h 34 min from Bortle 6
- M106 with the DwarfLab DWARF mini: 1 h 05 min from Bortle 6
- M106 with the DwarfLab Draco: 53 min from Bortle 6
- M106 with the DwarfLab DWARF II: 3 h 42 min from Bortle 6
- M106 with the Vaonis Vespera II: 1 h 05 min from Bortle 6
- M106 with the Vaonis Vespera Pro: 2 h 25 min from Bortle 6
- M106 with the Vaonis Vespera 3: 1 h 02 min from Bortle 6
- M106 with the Unistellar eQuinox 2: 59 min from Bortle 6
- M106 with the Unistellar Odyssey: 4 h 31 min from Bortle 6
- M106 with the Celestron Origin: 17 min from Bortle 6
- M106 with the Celestron Origin Mark II: 24 min from Bortle 6
All telescopes for the M106 · All targets for the Vespera Pro 2