Vaonis Vespera II: how long to image deep-sky targets

A 50 mm quadruplet on an 8 MP sensor with Vaonis’s mosaic mode for wide fields. Same optics class as the Seestar S50, four times the pixels.

SpecValue
Aperture50 mm
Focal length250 mm (f/5.0)
SensorSony IMX585, 3840 × 2160, 2.9 µm pixels
Pixel scale2.39″ per pixel
Field of view2.55° × 1.44° (153′ × 86′)
Sub exposures10 s (default 10 s)
FilterOptional screw-on dual-band and light-pollution filters from Vaonis.
Read noise used1 e⁻

Popular targets

Total integration for a solid image, 10 s subs, recommended filter.
TargetBortle 4Bortle 6Bortle 8
Andromeda GalaxyGalaxy42 min254 subs1 h 27 min525 subs4 h 04 min1,465 subs
Orion NebulaEmission nebula9 min56 subs17 min103 subs44 min265 subs
PleiadesReflection nebula1 h 16 min456 subs2 h 42 min971 subs7 h 38 min2,751 subs
Whirlpool GalaxyGalaxy29 min177 subs59 min352 subs2 h 39 min955 subs
Bode's GalaxyGalaxy31 min188 subs1 h 04 min383 subs2 h 56 min1,056 subs
Pinwheel GalaxyGalaxy2 h 08 min766 subs4 h 37 min1,661 subs13 h4,754 subs
Hercules ClusterGlobular cluster5 min30 subs7 min44 subs18 min107 subs
Dumbbell NebulaPlanetary nebula15 min89 subs27 min163 subs1 h 09 min416 subs
Ring NebulaPlanetary nebula5 min31 subs8 min47 subs17 min105 subs
Lagoon NebulaEmission nebula15 min88 subs28 min170 subs1 h 15 min452 subs
Eagle NebulaEmission nebula46 min275 subs1 h 35 min571 subs4 h 26 min1,595 subs
Omega NebulaEmission nebula12 min75 subs24 min143 subs1 h 03 min378 subs
Trifid NebulaEmission nebula33 min197 subs1 h 07 min402 subs3 h 05 min1,111 subs
Triangulum GalaxyGalaxy1 h 16 min456 subs2 h 42 min971 subs7 h 38 min2,751 subs
North America NebulaEmission nebula1 h 04 min385 subs2 h 15 min813 subs6 h 22 min2,294 subs
Western Veil NebulaSupernova remnant1 h 10 min419 subs2 h 28 min889 subs6 h 59 min2,512 subs
Eastern Veil NebulaSupernova remnant59 min353 subs2 h 04 min744 subs5 h 49 min2,094 subs
Elephant's Trunk NebulaEmission nebula1 h 47 min644 subs3 h 51 min1,388 subs11 h3,961 subs
Iris NebulaReflection nebula54 min325 subs1 h 53 min681 subs5 h 19 min1,913 subs
Pacman NebulaEmission nebula1 h 16 min456 subs2 h 42 min971 subs7 h 38 min2,751 subs
Heart NebulaEmission nebula2 h 08 min766 subs4 h 37 min1,661 subs13 h4,754 subs
Rosette NebulaEmission nebula1 h 04 min385 subs2 h 15 min813 subs6 h 22 min2,294 subs
Horsehead NebulaEmission nebula1 h 30 min542 subs3 h 13 min1,161 subs9 h 10 min3,301 subs
Flame NebulaEmission nebula24 min142 subs47 min284 subs2 h 09 min774 subs
California NebulaEmission nebula1 h 30 min542 subs3 h 13 min1,161 subs9 h 10 min3,301 subs
Helix NebulaPlanetary nebula1 h 30 min542 subs3 h 13 min1,161 subs9 h 10 min3,301 subs
Double ClusterOpen cluster5 min30 subs5 min30 subs6 min34 subs
NGC 891Galaxy1 h 17 min465 subs2 h 44 min986 subs7 h 44 min2,787 subs
Sombrero GalaxyGalaxy24 min146 subs47 min283 subs2 h 05 min753 subs
Sunflower GalaxyGalaxy48 min287 subs1 h 39 min593 subs4 h 35 min1,651 subs

All 170 targets have a page for the Vespera II.

Getting the most from the Vespera II

Fixed 10 s subs. Optional screw-on dual-band and light-pollution filters from Vaonis.

The Vespera II uses fixed 10 s subs, so the only levers you have are the sky you shoot from, the filter, and total time.

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.

Useful gear

Power, dew control and a stable tripod are what stop a long session early. Search links, not specific endorsements; check fit for your model.