How long to image the Hamburger Galaxy with the DwarfLab DWARF II
From a Bortle 6 suburban sky, the DwarfLab DWARF II needs about 8 h 37 min (2,069 subs of 15 s) for a solid image of the Hamburger Galaxy. A quick look takes 2 h 09 min; a showpiece 34 h. Under a Bortle 3 rural sky the solid figure drops to 4 h 15 min. At Bortle 6 the limit is a mix of skyglow and read noise. In this scope's field it fills 14% 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 | 57 min230 subs | 3 h 50 min920 subs | 15 h3,680 subs |
| Bortle 2Typical dark site | 1 h239 subs | 3 h 59 min956 subs | 16 h3,821 subs |
| Bortle 3Rural | 1 h 04 min256 subs | 4 h 15 min1,022 subs | 17 h4,088 subs |
| Bortle 4Rural / suburban transition | 1 h 14 min296 subs | 4 h 56 min1,184 subs | 20 h4,735 subs |
| Bortle 5Suburban | 1 h 30 min360 subs | 6 h1,440 subs | 24 h5,760 subs |
| Bortle 6Bright suburban | 2 h 09 min518 subs | 8 h 37 min2,069 subs | 34 h8,276 subs |
| Bortle 7Suburban / urban transition | 3 h 24 min817 subs | 14 h3,268 subs | 54 h13,069 subs |
| Bortle 8City | 5 h 20 min1,282 subs | 21 h5,128 subs | 85 h20,512 subs |
| Bortle 9Inner city | 9 h 28 min2,274 subs | 38 h9,096 subs | 150+ h36,384 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 11 h of run time. That is more than one night: over 2 nights, about 5 h 36 min each. The DWARF II’s battery is rated at about 3 h, so each night needs an external power bank. (Bortle 6, solid image; we allow 30% over the integration time.)
- USB-C PD power bank 10000mAh 18W18 W PD input; runs while charging.
- red LED head torchRed light keeps your night vision; white light costs you twenty minutes of dark adaptation every time.
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Everything that fits the DWARF II →
How it frames
The Hamburger Galaxy is 15′ × 3.6′ across. The DWARF II frames 3.19° × 1.79° at 2.99″ per pixel, so it fills 14% of the frame’s short side.
About the Hamburger Galaxy
The third member of the Leo Triplet, an edge-on with a thick dust lane and a faint tidal tail.
NGC 3628 · Galaxy in Leo · magnitude 9.5 · 15′ × 3.6′ · 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 DwarfLab DWARF II
The original pocket scope. 24 mm aperture and tiny 1.45 µm pixels mean it is slow per pixel, so bin or downsample and be patient.
15 s is the hard maximum in any mode; DwarfLab recommends EQ mode at 15 s. Two built-in filters, VIS and Astro (IR-pass); no dual-band. The optional UHC filter is no longer sold.
The DWARF II uses fixed 15 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.
Have an image of the Hamburger Galaxy from a DWARF II? Email it with your total time and sky to [email protected] and it goes here, credited.
Same target, other telescopes
- Hamburger Galaxy with the ZWO Seestar S50: 2 h 31 min from Bortle 6
- Hamburger Galaxy with the ZWO Seestar S50 Pro: 2 h 45 min from Bortle 6
- Hamburger Galaxy with the ZWO Seestar S30: 2 h 38 min from Bortle 6
- Hamburger Galaxy with the ZWO Seestar S30 Pro: 2 h 55 min from Bortle 6
- Hamburger Galaxy with the DwarfLab DWARF 3: 3 h 38 min from Bortle 6
- Hamburger Galaxy with the DwarfLab DWARF mini: 2 h 30 min from Bortle 6
- Hamburger Galaxy with the DwarfLab Draco: 2 h 04 min from Bortle 6
- Hamburger Galaxy with the Vaonis Vespera II: 2 h 31 min from Bortle 6
- Hamburger Galaxy with the Vaonis Vespera Pro: 5 h 38 min from Bortle 6
- Hamburger Galaxy with the Vaonis Vespera 3: 2 h 24 min from Bortle 6
- Hamburger Galaxy with the Vaonis Vespera Pro 2: 5 h 22 min from Bortle 6
- Hamburger Galaxy with the Unistellar eQuinox 2: 2 h 17 min from Bortle 6
- Hamburger Galaxy with the Unistellar Odyssey: 11 h from Bortle 6
- Hamburger Galaxy with the Celestron Origin: 40 min from Bortle 6
- Hamburger Galaxy with the Celestron Origin Mark II: 55 min from Bortle 6
All telescopes for the Hamburger Galaxy · All targets for the DWARF II