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SkyEye45AC 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 IMX366 full-frame CMOS sensor, SkyEye45AC Plus delivers an impressive 44.7MP resolution (8192 × 5460 pixels), combining outstanding image detail with excellent sensitivity for advanced deep-sky astrophotography.
Featuring 4.40μm pixels, 14-bit ADC, up to 40°C below ambient cooling, optimized amp-glow suppression, and a 512MB DDR3 buffer, SkyEye45AC Plus provides stable and reliable performance for long-exposure imaging.
Designed for astrophotographers seeking maximum detail, it is ideal for capturing wide-field nebulae, galaxies, and rich star fields with exceptional clarity.
- Sensor
- IMX366 Color
- Sensor Size
- 35.9×23.9mm
- Resolution
- 8192×5460
- Pixel Size
- 4.40μm
- Bit Depth (ADC)
- 14bit
- Data Interface
- USB3.0/2.0
- Dynamic Range
- 81.66 dB
- Maximum Frame Rate
- 74.0fps
- Quantum Efficiency
- >80%
- Full Well Capacity
- 73ke⁻ (14.9ke⁻in HCG)
- Maximum SNR
- 48.6 dB
- Read Noise
- 6.03–3.57e⁻ (LCG) / 1.35–0.88e⁻ (HCG)
- DDR3 Buffer
- 512MB
- TEC Cooling
- -35°C / -40°C
- Camera Weight
- 0.785kg
- Back Focus
- 17.5/12.5mm
Core Highlights
- Sony IMX366 Full-Frame Sensor
- Dual-stage TEC + PID Upgraded Cooling Up to -40°C Delta
- Expanded Front Window Reduced Vignetting
- High-Speed Data Transfer
- Built-in Sensor Tilt Adjustment
- Expanded Connectivity
- Ultra-Short Camera Back Focus Broad Accessory Compatibility
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.
Full frame·High pixels·Large field of view
SkyEye45AC Plus is equipped with Sony IMX366 back-illuminated full-frame sensor (35.9×23.9mm). At the same focal length, the field of view is approximately 1.6 times larger than that of APS-C format models, greatly improving shooting efficiency. Use it with a medium or short focus telescope to easily frame M31, the North American Nebula, the Veil Nebula and other wide-area targets, reducing the workload of mosaic stitching.
The high pixel count of 44.72 million preserves sufficient details for post-production cropping and partial enlargement.
Powerful Cooling and Lower Dark Current
SkyEye45AC 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 40°C, effectively suppressing thermal noise and dark current. When shooting all night, the long exposure dark field is pure and transparent, and higher quality images can be obtained after calibration.
Expanded Front Window and Reduced Vignetting
The sensor window on full-frame SkyEye Plus models expands from 39×27mm to 43×31mm, increasing the area by 26%. The larger clear aperture reduces edge vignetting caused by the protective-window opening, particularly with large-image-circle correctors that have short back focus and with other fast optical systems.
Monochrome models use a double-sided AR-coated protective window. Color models include an IR-cut window to reduce infrared interference in color imaging.
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.
Glow suppression, easy calibration in dark field
SkyEye45AC Plus uses Sony's back-illuminated CMOS sensor, combined with self-developed hardware-level glow suppression technology, to achieve excellent low-glow performance and maintain good consistency under long exposure or high-gain conditions, which can be removed after dark field calibration.
USB 3.0 & DDR3 512MB
High-Speed Buffer, Stable Transfer, No Dropped Frames
SkyEye45AC 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.
High Dynamic Range, Full Well and Quantum Efficiency
- Native High-Bit-Depth ADC: SkyEye45AC Plus is equipped with 14bit ADC, with natural colors and delicate levels.
- High sensitivity & high QE: The peak quantum efficiency 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
SkyEye45AC Plus supports the selection of LCG low gain mode, HCG high gain mode and low noise mode, up to 0.88e⁻ (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.
Dimensions and Interfaces
Back-Focus Configurations
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.