How long to image the M105 with the Vaonis Vespera Pro 2
From a Bortle 6 suburban sky, the Vaonis Vespera Pro 2 needs about 2 h 07 min (760 subs of 10 s) for a solid image of the M105. A quick look takes 32 min; a showpiece 8 h 26 min. Under a Bortle 3 rural sky the solid figure drops to 58 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 5% 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 | 13 min81 subs | 54 min324 subs | 3 h 36 min1,296 subs |
| Bortle 3Rural | 15 min88 subs | 58 min350 subs | 3 h 53 min1,400 subs |
| Bortle 4Rural / suburban transition | 17 min104 subs | 1 h 09 min414 subs | 4 h 35 min1,653 subs |
| Bortle 5Suburban | 21 min129 subs | 1 h 26 min514 subs | 5 h 42 min2,054 subs |
| Bortle 6Bright suburban | 32 min190 subs | 2 h 07 min760 subs | 8 h 26 min3,038 subs |
| Bortle 7Suburban / urban transition | 51 min308 subs | 3 h 25 min1,229 subs | 14 h4,913 subs |
| Bortle 8City | 1 h 21 min489 subs | 5 h 26 min1,956 subs | 22 h7,823 subs |
| Bortle 9Inner city | 2 h 26 min877 subs | 9 h 45 min3,508 subs | 39 h14,030 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 2 h 45 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.
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How it frames
The M105 is 5.4′ × 4.8′ across. The Vespera Pro 2 frames 1.65° × 1.65° at 1.68″ per pixel, so it fills 5% 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 | 58 min350 subs | 1 h 26 min514 subs | 3 h 25 min1,229 subs |
| 20 s | 50 min151 subs | 1 h 17 min232 subs | 3 h 16 min590 subs |
| 30 s | 47 min95 subs | 1 h 15 min150 subs | 3 h 14 min388 subs |
About the M105
An elliptical in the Leo I group, with NGC 3384 and NGC 3389 forming a tight trio.
NGC 3379 · Galaxy in Leo · magnitude 9.3 · 5.4′ × 4.8′ · best in Feb, Mar, Apr. 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 M105 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
- M105 with the ZWO Seestar S50: 1 h from Bortle 6
- M105 with the ZWO Seestar S50 Pro: 1 h 05 min from Bortle 6
- M105 with the ZWO Seestar S30: 1 h 02 min from Bortle 6
- M105 with the ZWO Seestar S30 Pro: 1 h 09 min from Bortle 6
- M105 with the DwarfLab DWARF 3: 1 h 27 min from Bortle 6
- M105 with the DwarfLab DWARF mini: 59 min from Bortle 6
- M105 with the DwarfLab Draco: 49 min from Bortle 6
- M105 with the DwarfLab DWARF II: 3 h 21 min from Bortle 6
- M105 with the Vaonis Vespera II: 1 h from Bortle 6
- M105 with the Vaonis Vespera Pro: 2 h 13 min from Bortle 6
- M105 with the Vaonis Vespera 3: 57 min from Bortle 6
- M105 with the Unistellar eQuinox 2: 53 min from Bortle 6
- M105 with the Unistellar Odyssey: 4 h 01 min from Bortle 6
- M105 with the Celestron Origin: 16 min from Bortle 6
- M105 with the Celestron Origin Mark II: 22 min from Bortle 6
All telescopes for the M105 · All targets for the Vespera Pro 2