How long to image the NGC 6914 with the DwarfLab Draco
From a Bortle 6 suburban sky, the DwarfLab Draco needs about 4 h 59 min (598 subs of 30 s) for a solid image of the NGC 6914. A quick look takes 1 h 15 min; a showpiece 20 h. Under a Bortle 3 rural sky the solid figure drops to 1 h 48 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 8% 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 | 22 min45 subs | 1 h 30 min180 subs | 5 h 59 min719 subs |
| Bortle 2Typical dark site | 24 min49 subs | 1 h 36 min193 subs | 6 h 25 min770 subs |
| Bortle 3Rural | 27 min55 subs | 1 h 48 min217 subs | 7 h 13 min867 subs |
| Bortle 4Rural / suburban transition | 34 min69 subs | 2 h 18 min276 subs | 9 h 11 min1,102 subs |
| Bortle 5Suburban | 46 min93 subs | 3 h 04 min369 subs | 12 h1,475 subs |
| Bortle 6Bright suburban | 1 h 15 min150 subs | 4 h 59 min598 subs | 20 h2,390 subs |
| Bortle 7Suburban / urban transition | 2 h 09 min259 subs | 8 h 37 min1,034 subs | 34 h4,134 subs |
| Bortle 8City | 3 h 34 min428 subs | 14 h1,711 subs | 57 h6,841 subs |
| Bortle 9Inner city | 6 h 34 min789 subs | 26 h3,154 subs | 110+ h12,614 subs |
Power and kit for this session
Allowing for slewing, focusing and rejected subs, that is about 6 h 28 min of run time. The Draco’s battery is rated at about 5 h, so the session needs an external power bank. (Bortle 6, solid image; we allow 30% over the integration time.)
- USB-C PD power bank 20000mAhRated 5 h on its 10,000 mAh battery. DwarfLab has not published the charging input, so check PD support before relying on it mid-session.
- 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 NGC 6914 is 6′ across. The Draco frames 1.66° × 1.24° at 1.46″ per pixel, so it fills 8% of the frame’s short side.
Longer subs
Auto Mode picks the exposure; Pro Mode allows up to 300 s, held by built-in guiding and field derotation. The 30 s default here is our assumption. Time for a solid image by sub length:
| Sub length | Bortle 3 | Bortle 5 | Bortle 7 |
|---|---|---|---|
| 30 s | 1 h 48 min217 subs | 3 h 04 min369 subs | 8 h 37 min1,034 subs |
| 60 s | 1 h 32 min93 subs | 2 h 48 min169 subs | 8 h 21 min501 subs |
| 120 s | 1 h 24 min43 subs | 2 h 40 min81 subs | 8 h 13 min247 subs |
| 300 s | 2 h 30 min30 subs | 2 h 35 min32 subs | 8 h 08 min98 subs |
Leave the dual-band filter out for the NGC 6914. It is a reflection nebula, and it shines right across the spectrum. A dual-band filter keeps two emission lines and throws the rest away, so most of the light you came for is being stopped along with the sky. From a Bortle 6 sky it would be roughly 11 times slower.
About the NGC 6914
Blue reflection patches floating on a sea of red hydrogen in Cygnus. Broadband for the blue; dual-band would remove the point.
vdB 131/132 · Reflection nebula in Cygnus · magnitude 9.0 · 6′ · best in Jul, Aug, Sep. Reachable from mid-northern latitudes (UK, northern US, central Europe) and from the south.
Reflection nebulae are starlight scattered by dust, so they are broadband and blue. A dual-band filter removes almost all of it; do not use one. These are among the faintest structures a smart scope can attempt and the figures run long. A dark sky matters more here than for any other type, and the Moon must be down.
About the DwarfLab Draco
DwarfLab’s big scope: 90 mm of folded f/3.8 optics, the most aperture of any Seestar or DWARF, a narrow 13 nm dual-band filter and 300 s subs with built-in guiding. A small-target scope; big nebulae need its mosaic mode.
Auto Mode picks the exposure; Pro Mode allows up to 300 s, held by built-in guiding and field derotation. The 30 s default here is our assumption. Built-in Hα + OIII dual-narrowband filter, 13 nm per line; the SHO Edition adds an SII option.
Longer subs matter most under dark skies, where read noise rather than skyglow sets the floor. From a city the difference between 30 s and 300 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 NGC 6914 from a Draco? Email it with your total time and sky to [email protected] and it goes here, credited.
Same target, other telescopes
- NGC 6914 with the ZWO Seestar S50: 6 h 04 min from Bortle 6
- NGC 6914 with the ZWO Seestar S50 Pro: 6 h 38 min from Bortle 6
- NGC 6914 with the ZWO Seestar S30: 6 h 23 min from Bortle 6
- NGC 6914 with the ZWO Seestar S30 Pro: 7 h 02 min from Bortle 6
- NGC 6914 with the DwarfLab DWARF 3: 8 h 48 min from Bortle 6
- NGC 6914 with the DwarfLab DWARF mini: 6 h 02 min from Bortle 6
- NGC 6914 with the DwarfLab DWARF II: 21 h from Bortle 6
- NGC 6914 with the Vaonis Vespera II: 6 h 04 min from Bortle 6
- NGC 6914 with the Vaonis Vespera Pro: 14 h from Bortle 6
- NGC 6914 with the Vaonis Vespera 3: 5 h 48 min from Bortle 6
- NGC 6914 with the Vaonis Vespera Pro 2: 13 h from Bortle 6
- NGC 6914 with the Unistellar eQuinox 2: 5 h 33 min from Bortle 6
- NGC 6914 with the Unistellar Odyssey: 26 h from Bortle 6
- NGC 6914 with the Celestron Origin: 1 h 36 min from Bortle 6
- NGC 6914 with the Celestron Origin Mark II: 2 h 12 min from Bortle 6