ZWO

ZWO ASI2600MC Duo

Name: ZWO ASI2600MC Duo
Brand: ZWO

The acclaimed 26-megapixel APS-C colour camera with a guide sensor built in — one body that images and guides at once, so you drop the guide scope, the off-axis guider and half the cabling.

91/ 100

Polaris Score

#1 of 6 cooled one-shot-colour cameras

See the breakdown ↓

Type

One-shot colour

Cooling

−35°C

Pixel Size

3.76µm

Read noise

1.0 – 3.3 e⁻

Resolution

26 MP · 6248×4176

Sensor

Sony IMX571 · APS-C

From$1,799

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The frame it captures

Same camera. Different telescope. A completely different photograph.

A camera has no field of view of its own — the telescope in front of it decides everything. Pick a target and watch the same 26-megapixel frame become three different images.

RedCat 51

250 mm · f/4.9

FOV 5.4° × 3.6°

Framed with space to spare — the full disc and both companions.

Esprit 100ED

550 mm · f/5.5

FOV 2.4° × 1.6°

Fills the frame edge to edge — the classic full-galaxy portrait.

EdgeHD 8

2032 mm · f/10

FOV 0.66° × 0.44°

Overflows frame

Only the bright core fits; the spiral arms spill off the sensor.

Explore any telescope in the Simulator →

01What it's good at

What it's best at — and the trade-offs.

The same IMX571 APS-C sensor as the acclaimed 2600MC Pro, with ~91% QE, 1 e⁻ read noise and a 16-bit readout

Best at

✓The same IMX571 APS-C sensor as the acclaimed 2600MC Pro, with ~91% QE, 1 e⁻ read noise and a 16-bit readout

✓A built-in guide sensor images guide stars off the same light path, so you guide without a guide scope or off-axis guider

✓Deep, regulated cooling to 35°C below ambient makes dark frames repeatable and keeps thermal noise low on long subs

✓One-shot colour means every sub is already colour, the simplest path from the sky to a finished picture

Trade-offs

!The built-in guide sensor sees a small, fixed patch of sky, so on sparse fields a usable guide star is not always guaranteed

!As a one-shot-colour camera it resolves a little less fine detail than a mono sensor of the same chip

!The large APS-C sensor demands a well-corrected, flat field, an uncorrected or slow scope will show soft, elongated corners

02In plain English

The numbers, in plain English.

Sony IMX571 · 26 MP · 3.76µm · Two-stage TEC

Built-in guide sensorThe Duo's whole point

No separate guider

A second sensor images guide stars off the same light path, so you guide without a guide scope or off-axis guider, one camera, one cable, two jobs.

APS-C sensorFrames large objects

23.5 × 15.7 mm

A big field that captures whole nebulae and galaxies at once, but it demands a flat, well-corrected optical field to keep the corners sharp.

1.0 e⁻ read noiseFaint signal survives

Very low

The camera adds almost no noise of its own, so short subs still hold faint detail, a real advantage under light pollution.

3.76 µm pixelsWide compatibility

Balanced

A middle-ground pixel size that samples well across a broad range of focal lengths, from fast astrographs to longer scopes.

−35°C coolingRepeatable darks

Regulated TEC

Deep, set-point cooling drives down thermal noise and lets you reuse a dark-frame library night to night.

~91% peak QECatches faint light

Highly sensitive

The sensor converts nearly every photon that lands on it, so faint targets build signal fast.

03Typical targets

What it shines on.

North America Nebula, Andromeda Galaxy (M31), Orion Nebula (M42), Rosette Nebula, Pleiades…

Comes alive

North America Nebula

The large APS-C field frames the whole continent shape in a single exposure, and a dual-band filter makes the emission glow.

Comes alive

Andromeda Galaxy (M31)

Big enough to nearly fill the frame, with dust lanes and both companion galaxies riding along in the same field.

Comes alive

Orion Nebula (M42)

The bright core and the sweeping wings together, the high dynamic range holding both the blazing Trapezium and the faint outer folds.

Excellent

Rosette Nebula

The full flower of gas fits the frame whole, ideal for one-shot colour with a light-pollution or dual-band filter.

Excellent

Pleiades (M45)

The whole cluster with room for the faint blue reflection nebulosity that only long, guided exposures reveal.

Excellent

Veil Nebula

The delicate supernova filaments stretch across the wide field, guided subs keeping every thread sharp.

04Build your imaging rig

Everything you'd actually buy.

The telescope · Pair it · Filter it

The telescope

What it images through

Fast apo astrograph · f/4–f/6

Its natural partner, a flat, well-corrected APS-C field for whole-nebula framing

Small refractor · 60–80 mm

Wide-field colour on large targets, an easy, portable imaging pairing

8-inch f/4 imaging Newtonian

More aperture and reach with a coma corrector to flatten the fast field

Pair it

What completes the rig

A tracking EQ mount

The guided long exposures the Duo is built for need a solid equatorial mount

No guide scope needed

The built-in guider replaces the usual guide scope and second camera outright

Field flattener / reducer

Matches the scope to the APS-C field so stars stay round into the corners

Filter it

What transforms the view

Dual-band (Ha/OIII) filter

The key filter for one-shot colour on emission nebulae from the city

Light-pollution filter

Lifts broadband targets like galaxies out of a bright suburban sky

2-inch filter drawer

Swap filters without breaking the imaging train or shifting focus

05The Polaris Score

How it scores, and why.

91/100 · #1 of 6 cooled one-shot-colour cameras

91/ 100

ZWO ASI2600MC Duo

#1 of 6 cooled one-shot-colour cameras

It pairs the best-loved APS-C colour sensor in the hobby with a built-in guider, removing hardware and failure points without giving up image quality. It loses a little to a pure imaging camera only on the modest price premium the guide sensor adds.

Image quality

Low-light sensitivity

Ease of use

Value

Polaris weighs how well the camera does the job it was designed for — image quality, sensitivity, versatility and value — never list price or brand.

06Who it's for

An honest fit check.

Deep-sky imagers who want a cooled APS-C colour camera and hate wrestling with a separate…

Buy it if you

✓Deep-sky imagers who want a cooled APS-C colour camera and hate wrestling with a separate guide scope

✓People building a compact or travel rig where every removed component and cable matters

✓Beginners stepping up from a DSLR who want a capable, guided setup without assembling a guiding chain themselves

✓Anyone imaging at longer focal lengths where reliable guiding is essential

Look elsewhere if you

!Mono imagers chasing the deepest narrowband detail, who want a filter wheel and a mono sensor instead

!Planetary and lunar imagers, who are better served by a small, fast, uncooled high-frame-rate camera

!Imagers who already own a well-sorted guide scope and camera and do not need the integrated guider

!Anyone on the tightest budget, since the built-in guide sensor adds a small premium over the plain 2600MC Pro

07The numbers

Full specifications.

28 measured and stated values

Sensor

ModelSony IMX571

TypeCMOS · APS-C

Diagonal28.3 mm

Resolution6248 × 4176

Megapixels26 MP

Pixel Size3.76µm

Bit depth16-bit ADC

Noise & sensitivity

Read noise1.0 – 3.3 e⁻

Full well50,000 e⁻

Peak QE~91%

Dynamic range14 stops

Cooling

Cooling typeTwo-stage TEC

Cooling−35°C

Anti-dew heaterYes

Regulation±0.1°C setpoint

Connectivity & fit

InterfaceUSB 3.0

Onboard buffer512 MB DDR3

Backfocus17.5mm

ThreadM42 / M48

Weight0.7 kg

More

cooledtrue

guide sensorIntegrated · shares the imaging light path

guidingBuilt-in guide sensor (no guide scope / OAG)

Sensor Height15.7mm

Sensor Width23.5mm

Editor’s Take

The 2600MC Pro is the camera most imagers should own; the Duo is that camera with the single most annoying part of a deep-sky rig, guiding, folded inside. No guide scope to align, no off-axis prism to fiddle with, one USB cable doing two jobs. For a compact or travel setup it is close to the ideal one-and-done colour camera.