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SkyEye26AC Plus
The SkyEye Plus series evolves ToupTek Astro’s flagship cooled-camera platform
with a redesigned structure, stronger cooling, expanded connectivity
and greater operating stability.
Powered by the Sony IMX571 APS-C sensor, the SkyEye26AC Plus delivers 26MP resolution, 3.76μm pixels, and a 16-bit ADC for detailed, high-quality deep-sky imaging.
Featuring advanced two-stage TEC cooling with up to 43°C temperature reduction, ultra-low read noise, zero amp-glow performance, and a 512MB DDR3 buffer, it provides clean, stable images during long exposures.
- Sensor
- IMX571 Color
- Sensor Size
- 23.4×15.7mm
- Resolution
- 6224×4168
- Pixel Size
- 3.76μm
- Bit Depth (ADC)
- 16bit
- Data Interface
- USB3.0/2.0
- Dynamic Range
- 86.8 dB
- Maximum Frame Rate
- 110.1fps
- Quantum Efficiency
- >80%
- Full Well Capacity
- 51ke⁻
- Maximum SNR
- 47.1 dB
- Read Noise
- 2.6–1.14e⁻ (LCG) / 1.18–0.79e⁻ (HCG)
- DDR3 Buffer
- 512MB
- TEC Cooling
- -35°C / -43°C
- Camera Weight
- 0.785kg
- Back Focus
- 17.5/12.5mm
Core Highlights
- Sony IMX571 APS-C Sensor
- Up to Δ43°C
- High-Speed Data Transfer
- Built-in Sensor Tilt Adjustment
- Expanded Connectivity
- Ultra-Short Camera Back Focus Broad Accessory Compatibility
APS-C format
SkyEye26AC Plus is equipped with Sony IMX571 color back-illuminated sensor with 26 million effective pixels. Compared with full-frame sensors, APS-C format combines high performance, wide field of view and high cost-effectiveness, is more friendly to supporting equipment requirements, can be adapted to most focal length telescopes, and has outstanding imaging performance. From experienced enthusiasts to novices, everyone can find their own way of playing.
Powerful Cooling and Lower Dark Current
SkyEye26AC Plus adopts a newly upgraded TEC and active cooling system, combined with PID precise temperature control algorithm, which makes the temperature control more uniform. At the same time, the cooling temperature difference further breaks through to about 43°C, effectively suppressing thermal noise and dark current. When shooting all night long, the long exposure dark field is pure and transparent, and higher quality images can be obtained after calibration.
Four-Level Anti-Dew Heating
The sealed, dry sensor chamber helps prevent condensation on the CMOS sensor and the inner surface of the optical window during cooling. An integrated window heater provides four adjustable power levels to keep the optical path clear in humid conditions and across large temperature changes.
USB 3.0 & DDR3 512MB
High-Speed Buffer, Stable Transfer, No Dropped Frames
SkyEye26AC Plus supports USB 3.0 transmission and has a built-in DDR3 512MB cache to ensure reliable data transmission. At the same time, the cache can also greatly avoid the glow phenomenon caused by slow transmission speed, ensuring smooth shooting.
Zero Amp-Glow for Cleaner Long Exposures
SkyEye26AC Plus uses Sony's back-illuminated non-glow CMOS sensor, which effectively avoids the common glow problem of traditional front-illuminated sensors and maintains a uniform and clean background signal under high gain and long exposure conditions. Calibration is easier and post-processing is more efficient.
High Dynamic Range and Quantum Efficiency
- Native High-Bit-Depth ADC: SkyEye26AC Plus is equipped with 16bit ADC, with natural colors and delicate levels.
- High sensitivity & high QE: The peak quantum efficiency of SkyEye26AC Plus is >80%, the spectral response is wider, the light sensitivity is more sensitive, and the ability to capture weak light signals is greatly improved.
Camera Performance Curves
SkyEye26AC Plus supports the selection of LCG low gain mode, HCG high gain mode and low noise mode, as low as 0.79e⁻ (HCG mode is turned on, and the maximum gain is set).
HCG mode: Setting high gain can effectively reduce readout noise and provide excellent high dynamic performance, suitable for shooting dim targets.
LCG mode: Setting low gain can expand the full well capacity, effectively prevent overexposure of the picture, retain more details, and is suitable for shooting bright targets.
Low noise mode: Reduce the frame rate to obtain lower readout noise while maintaining a high dynamic range, further restoring the true brightness and color changes of celestial objects.
Expanded Connectivity and Reinforced Power
The integrated 5-port USB hub (4×USB 2.0, 1×USB 3.0) allows direct connection of accessories such as filter wheels, guide cameras, and focusers, reducing cable clutter and simplifying setup.
The optimized power system maintains stable camera operation during continuous cooling and high accessory loads throughout an imaging session.
Note: The SkyEye Plus camera body can operate from a 12V/3A supply. A DC 12V/5A supply is strongly recommended when using the USB hub. USB 3.0 is used only for high-speed data transfer and does not power the camera or connected accessories.
Built-in Sensor Tilt Adjustment and Convenient Calibration
The SkyEye Plus body includes three sets of precision adjustment screws, allowing the sensor plane to be aligned with the telescope focal plane without an additional accessory for more uniform stars across the field.
- Push screw: turn clockwise to increase the gap between the sensor-tilt ring and the camera.
- Pull screw: turn clockwise to reduce the gap between the sensor-tilt ring and the camera.
Note: Avoid large adjustments. Loosen the opposing screw before turning any adjustment screw. For example, loosen the matching push screw counterclockwise before tightening a pull screw clockwise; otherwise, the mechanism may be damaged.
The series also supports the SkyEye rear four-point sensor tilt ring. The replacement does not consume additional optical length and retains the standard 12.5mm/17.5mm back focus.
Shorter Back Focus and Flexible Adaptation
Every model uses an M54×0.75 female thread and includes a full-size M54 extension tube and adapter ring for a standard 55mm optical train. Removing the front adapters reduces the camera back focus to 12.5mm or 8.5mm for greater compatibility with optical systems and accessories.
- 17.5mm back focus: M54×0.75 female thread plus six M2.5 accessory mounting holes.
- 12.5mm back focus: M54×0.75 female thread plus six M2.5 accessory mounting holes.
- 8.5mm camera-body back focus: sensor-tilt screw holes, without an M54 mounting thread.
Back-Focus Configurations
Dimensions and Interfaces
Package Contents
Note: A power adapter is not included with SkyEye Plus cameras. If required, choose the optional high-quality Huntkey 12V/5A adapter. When purchasing separately, use a reputable adapter brand such as Huntkey or Mean Well.