Why does the Ring Nebula look so small in my smart telescope?

Because it actually is small — about 1.5 by 1 arcminutes, roughly a fifteenth the width of the full Moon. Every smart scope will show it as a tiny bright donut surrounded by empty frame; that's normal, not a focus problem. Crop in post rather than expecting it to fill the field.

Should I use the dual-band or duo-band filter on M57?

Yes, and this is the exception to the usual rule. Planetary nebulae like M57 emit strongly in Oxygen-III, one of the two wavelengths dual-band/duo-band filters pass, so unlike galaxies they genuinely benefit from the nebula filter. Leave it on.

How long do I need to integrate on the Ring Nebula?

20-30 minutes gets a clean, bright ring. An hour or more starts pulling out the faint outer halo and the central white dwarf, which is a much harder catch and not guaranteed on smaller apertures.

Ring Nebula (M57): Small Target, Big Payoff

Heads up: this article may contain affiliate links (Amazon Associates). If you buy through one, we earn a small commission at no extra cost to you — it doesn't change what we recommend. Full disclosure.

The Ring Nebula is the opposite problem from Andromeda: instead of being too big for your smart telescope's field of view, M57 is so small — about 1.5 by 1 arcminutes, a fifteenth the width of the full Moon — that it barely registers as more than a bright dot on the live-stack preview. Don't let that fool you. It's one of the brightest, easiest, most rewarding targets in the summer sky, and it needs almost none of the mosaic wrangling that makes galaxies frustrating.

Why this one is easy

At magnitude 8.8, the Ring Nebula is bright for a deep-sky object, and it sits in Lyra right next to Vega, one of the easiest stars in the sky to locate — no star-hopping required, GoTo finds it instantly. The real skill here isn't hunting for a faint smudge, it's exposing for a small, bright target without blowing out its core.

The target card

	Data
Type	Planetary nebula
Constellation	Lyra
Apparent size	~1.5' × 1'
Distance	~2,570 light-years
Magnitude	8.8
Best months	June–September (culminates in August)
Difficulty	Easy to find, small in-frame

Filter: this is the exception to the rule

Our filters guide covers the general rule: dual-band/duo-band filters are for emission nebulae, off for everything broadband. The Ring Nebula breaks that pattern. As a planetary nebula, M57 shines strongly in Oxygen-III, one of the two wavelengths a dual-band or duo-band filter isolates, so the Seestar LP filter or the Dwarf 3's duo-band filter both genuinely help here rather than costing you light the way they would on a galaxy (see the manufacturers' own Seestar and Dwarf 3 spec pages for the filter-wheel details).

Settings by scope

Seestar S50 / S30. LP (dual-band) filter on. 10-20s subs. 20-30 minutes gets a clean, well-exposed ring; push to 60+ minutes if you want a shot at the faint outer halo.

Dwarf 3. Duo-band filter on the tele lens. The 8.3MP sensor gives you real cropping room afterward, which matters more here than on almost any other target since M57 fills so little of the raw frame.

The one thing to get right

Don't judge exposure by how the ring looks at 5 minutes — the core is bright enough to look "done" fast, which tempts people to stop early and miss the faint halo entirely. Let it run the full 20-30 minutes even though the live preview looks finished halfway through. If you want to chase the central white dwarf and outer halo detail, that's genuinely an hour-plus target and not guaranteed on sub-$1,000 apertures.

Shooting through August? Check our monthly targets guide for what else is well-placed alongside M57 this season, and see the price-tier buying guide if you're still deciding which scope handles small targets best.