ZWO Seestar S30 Pro: how long to image deep-sky targets

The S30 optics upgraded to a quadruplet in front of an 8 MP IMX585. Same speed per pixel as the S30, four times the pixels, so you can crop hard.

SpecValue
Aperture30 mm
Focal length160 mm (f/5.3)
SensorSony IMX585, 3840 × 2160, 2.9 µm pixels
Pixel scale3.74″ per pixel
Field of view3.99° × 2.24° (239′ × 135′)
Sub exposures10 s, 20 s, 30 s (default 10 s)
FilterBuilt-in filter wheel with dual-band filter.
Read noise used1 e⁻

Popular targets

Total integration for a solid image, 10 s subs, recommended filter.
TargetBortle 4Bortle 6Bortle 8
Andromeda GalaxyGalaxy50 min300 subs1 h 41 min609 subs4 h 40 min1,678 subs
Orion NebulaEmission nebula, dual-band12 min73 subs15 min89 subs24 min146 subs
PleiadesReflection nebula1 h 30 min541 subs3 h 08 min1,127 subs8 h 45 min3,152 subs
Whirlpool GalaxyGalaxy35 min209 subs1 h 08 min407 subs3 h 02 min1,094 subs
Bode's GalaxyGalaxy37 min222 subs1 h 14 min444 subs3 h 22 min1,210 subs
Pinwheel GalaxyGalaxy2 h 31 min908 subs5 h 21 min1,927 subs15 h5,446 subs
Hercules ClusterGlobular cluster5 min31 subs8 min51 subs20 min123 subs
Dumbbell NebulaPlanetary nebula, dual-band20 min118 subs24 min144 subs39 min232 subs
Ring NebulaPlanetary nebula, dual-band7 min43 subs8 min49 subs11 min69 subs
Lagoon NebulaEmission nebula, dual-band19 min113 subs24 min142 subs40 min240 subs
Eagle NebulaEmission nebula, dual-band56 min338 subs1 h 14 min442 subs2 h 13 min798 subs
Omega NebulaEmission nebula, dual-band16 min98 subs20 min121 subs34 min203 subs
Trifid NebulaEmission nebula, dual-band41 min245 subs53 min317 subs1 h 34 min564 subs
Triangulum GalaxyGalaxy1 h 30 min541 subs3 h 08 min1,127 subs8 h 45 min3,152 subs
North America NebulaEmission nebula, dual-band1 h 18 min470 subs1 h 43 min619 subs3 h 09 min1,135 subs
Western Veil NebulaSupernova remnant, dual-band1 h 25 min510 subs1 h 52 min674 subs3 h 26 min1,239 subs
Eastern Veil NebulaSupernova remnant, dual-band1 h 12 min433 subs1 h 35 min569 subs2 h 53 min1,039 subs
Elephant's Trunk NebulaEmission nebula, dual-band2 h 09 min776 subs2 h 53 min1,036 subs5 h 22 min1,932 subs
Iris NebulaReflection nebula1 h 04 min384 subs2 h 12 min790 subs6 h 05 min2,191 subs
Pacman NebulaEmission nebula, dual-band1 h 32 min555 subs2 h 02 min734 subs3 h 46 min1,354 subs
Heart NebulaEmission nebula, dual-band2 h 33 min920 subs3 h 25 min1,232 subs6 h 25 min2,309 subs
Rosette NebulaEmission nebula, dual-band1 h 18 min470 subs1 h 43 min619 subs3 h 09 min1,135 subs
Horsehead NebulaEmission nebula, dual-band1 h 49 min656 subs2 h 25 min872 subs4 h 29 min1,617 subs
Flame NebulaEmission nebula, dual-band30 min179 subs38 min229 subs1 h 06 min399 subs
California NebulaEmission nebula, dual-band1 h 49 min656 subs2 h 25 min872 subs4 h 29 min1,617 subs
Helix NebulaPlanetary nebula, dual-band1 h 49 min656 subs2 h 25 min872 subs4 h 29 min1,617 subs
Double ClusterOpen cluster5 min30 subs5 min30 subs6 min39 subs
NGC 891Galaxy1 h 32 min550 subs3 h 10 min1,143 subs8 h 52 min3,192 subs
Sombrero GalaxyGalaxy29 min172 subs54 min327 subs2 h 24 min862 subs
Sunflower GalaxyGalaxy56 min339 subs1 h 55 min688 subs5 h 15 min1,891 subs

All 170 targets have a page for the Seestar S30 Pro.

Getting the most from the Seestar S30 Pro

20 s and 30 s subs need EQ mode. Built-in filter wheel with dual-band filter.

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.

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.