ZWO ASI2600MM Pro V2 Cooled Mono Camera

Sony IMX571: A 26.1 MP, APS-C Format, and 3.76µm Imager

At the heart of the ASI2600MM Pro is the monochrome Sony IMX571 sensor, combining a large 28.3mm diagonal APS-C format with a high-resolution 6248 x 4176 pixel array. This large sensor area suits expansive targets like the Andromeda Galaxy (M31) or the Veil Nebula complex with short focal length refractors (about 300mm or less for the whole Veil).

The sensor's 3.76µm pixels provide an excellent balance between resolution and sensitivity, creating a versatile image scale with a wide range of telescopes. This pixel size gives detailed sampling on short focal length instruments and a fine image scale on longer ones.

91% Peak QE and 1.0e Read Noise

The IMX571 is a back-side illuminated (BSI) sensor, a design that places the wiring layer behind the photodiodes to maximize incoming light. This architecture allows the ASI2600MM Pro to achieve a peak Quantum Efficiency of 91%, meaning it converts about 9 in 10 photons at its peak wavelength. This high sensitivity reduces the total integration time needed to achieve a deep, high-signal image.

When the camera's gain is set to 100, a High Conversion Gain (HCG) mode automatically engages. This substantially reduces readout noise while preserving dynamic range, with read noise of 1.0 to 3.3e. For most deep-sky targets, using a gain of either 0 (for maximum dynamic range on bright objects) or 100 (for the lowest noise on faint targets) is recommended for optimal results.

True 16-bit ADC and 73ke Full Well Capacity

The ASI2600MM Pro features a native 16-bit Analog-to-Digital Converter (ADC), providing 65,536 distinct levels of data for each pixel. This enables a true 14-stop dynamic range with smooth tonal transitions and richer color gradients.

Complementing the 16-bit ADC is a deep full well capacity of 73,000 electrons (73ke). This allows individual pixels to collect a large amount of charge before saturating, which helps bright stars in dense fields like the Hercules Cluster (M13) hold color. With the 14-stop dynamic range, the camera captures both the faintest details and the brightest highlights within a single frame.

Two-Stage TEC Cooling to 35°C Below Ambient with Zero Amp Glow

Thermal noise, or dark current, is the primary enemy of long-exposure astrophotography. The ASI2600MM Pro uses a two-stage thermoelectric (TEC) cooling system that lowers the sensor temperature by 30-35°C below ambient (the 35°C delta T is measured at 30°C ambient; it falls as the ambient temperature falls). This greatly reduces dark current: 0.0022e⁻/s/pix at 0°C and 0.00012e⁻/s/pix at -20°C.

• Zero Amplifier Glow: A hardware-level circuit is designed to remove amp glow, a common artifact where heat from readout electronics causes the corners of an image to brighten. This simplifies your calibration workflow, as dark frames only need to subtract uniform thermal noise.
• Anti-Dew Heater: An integrated polyimide heater with a power of around 5W fits the protective window to avoid dew problems, and can be turned off in software to save power.

14.3 FPS Capture with a 512MB DDR3 Buffer

The ASI2600MM Pro pairs its USB 3.0 interface with a dedicated 512MB DDR3 memory buffer. This minimizes data loss and latency, delivering fast, stable and secure transmission even during long exposures and continuous high-resolution capture.

The camera utilizes a USB 3.0 interface to achieve a maximum frame rate of 14.3 FPS at full 16-bit resolution. While primarily a deep-sky camera, this speed is useful for high-resolution lunar and solar imaging (with a safe solar filter) and makes focusing and framing objects significantly faster and more responsive.

17.5mm Back Focus and Integrated Tilt Adjuster

Achieving a flat field with sharp stars from corner to corner requires precise sensor alignment and spacing. The ASI2600MM Pro features a built-in tilt adjuster plate, allowing you to fine-tune the sensor's orthogonality relative to your telescope's optical axis. This helps correct field tilt, especially when using fast optical systems with demanding flatteners or reducers.

The camera body has a native back focus distance of 17.5mm. The package includes a 21mm M42 extender and a 16.5mm M42-M48 extender: 17.5 + 21 + 16.5 = 55mm, the optimal back focus that many correctors use. This integrated solution simplifies building a rigid and precise imaging train.

ASI2600MM Pro vs. ASI2600MC Pro: The 91% vs. 80% QE Difference

The primary difference between the monochrome ASI2600MM Pro and its color (MC) sibling is sensitivity and imaging workflow. The monochrome version lacks a Bayer filter matrix, allowing it to achieve a significantly higher peak quantum efficiency of 91% compared to the color version's 80%.

• Monochrome Advantage: The MM Pro's higher QE means it gathers more light in the same amount of time, resulting in deeper images with less noise. It gives you full control over your data, allowing for LRGB imaging to capture true broadband color and the use of narrowband filters (H-alpha, OIII, SII) to isolate specific emission lines from light-polluted skies.
• Color Simplicity: The MC Pro offers a simpler workflow, capturing full-color images in a single shot without the need for a filter wheel or multiple exposures. While less sensitive overall, it is an excellent choice for users who prioritize convenience and a faster path to a final image.

12V DC Power and USB 3.0 Interface

To power the two-stage TEC cooler, anti-dew heater, and internal electronics, the ASI2600MM Pro requires an external power source. Use a 12V DC adapter rated 3A to 5A (5.5x2.1mm, center pole positive) or an 11-14V lithium battery; external power supplies are needed for all ASI cooled cameras.

The camera body weighs a manageable 700 g (1.54 lb) and has a diameter of 90mm, making it compatible with a wide range of focusers and mounts. It is fully supported by ZWO's native ASIStudio software suite, ASCOM/INDI drivers for third-party software, and is compatible with Windows, Mac OSX, and Linux operating systems.