ToupTek Astro
Guide Camera
Large Sensor · High Sensitivity
GPM585M
Deep-Sky Guiding · Infrared Imaging
GPM585M is designed for deep-sky guiding and infrared imaging. It features a back-illuminated Sony IMX585M monochrome CMOS sensor with a 1/1.2-inch format, 2.9 μm square pixels and 3840 × 2160 resolution. Its high quantum efficiency at 650 nm makes it suitable for infrared Milky Way imaging under light-polluted skies.
- Sensor model
- IMX585M
- Sensor format
- 1/1.2″
- Resolution
- 3840x2160
- ADC bit depth
- 12 bit / 16 bit (HDR)
- Pixel size
- 2.9um
- Data interface
- USB 2.0 Type-C
- Dynamic range
- 88.09 dB (HDR)
- Frame rate
- 18.2 fps @ 1920 × 1080 (8 bit)
- Quantum efficiency
- >91%
- Full-well capacity
- 39.75 ke⁻
- Maximum SNR
- 44 dB
- Read noise
- 4.29–0.52 e⁻
IMX585M Large-Area, High-Sensitivity Sensor
Replaceable Filter Window for Infrared Imaging
The factory-installed AR-coated protective window is held inside the adapter ring. For infrared imaging, it can be removed and replaced with a filter. Refer to the technical specifications for the window dimensions and recommended filter size.
Native 12-Bit ADC with Hardware ROI
| Resolution | 12-bit output | 8-bit output |
|---|---|---|
| 3840 × 2160 | 1.5 fps | 4.5 fps |
| 1920 × 1080 | 9.6 fps | 18.2 fps |
The camera captures native 12-bit data and also supports 8-bit output. Hardware ROI lets you select a smaller area of interest for a higher frame rate. At 1920 × 1080 in 8-bit mode, the camera reaches its listed frame rate for guiding and live preview.
Built-In Frame Buffer
The built-in frame buffer temporarily stores image data before transferring it to a computer or other receiving device. This helps reduce amp glow caused by slow data readout. When multiple cameras operate at the same time, each can still reach its maximum frame rate.
Three Gain Modes
GPM585M supports HCG (High Conversion Gain), LCG (Low Conversion Gain) and HDR (High Dynamic Range). Use HCG to improve sensitivity in low-light conditions, LCG to retain a wider dynamic range for bright targets, or HDR to preserve detail across highlights and shadows. The HDR dynamic range is listed in the technical specifications.
Software Compatibility
GPM585M works with StellaVita App and ToupSky. It supports ASCOM, INDI and DirectShow SDKs, allowing compatible third-party astronomy software to use the camera through ToupTek Astro drivers.
Camera Interfaces and Dimensions
Pairing a large-sensor guide camera with the OAG-X provides a wider guiding field of view.
Package Contents
Technical Specifications
| Model | GPM585M |
|---|---|
| Sensor model | IMX585M |
| Sensor format | 1/1.2″ |
| Sensor diagonal | 12.85mm |
| Active sensor area | 11.2x6.3mm |
| Resolution | 3840x2160 |
| Pixel size | 2.9um |
| Green sensitivity | 9560 mV at 1/30 s |
| ADC / output modes | 12 bit / 16 bit (HDR) |
| Quantum efficiency | >91% |
| Maximum SNR | 44 dB |
| Dynamic range | 88.09 dB (HDR) |
| Full-well capacity | 39.75 ke⁻ |
| Read noise | 4.29–0.52 e⁻ |
| Maximum frame rate | 18.2 fps @ 1920 × 1080 (8 bit) |
| Data interface | USB 2.0 Type-C |
| Binning | 1 × 1 to 8 × 8 |
| Exposure time | 0.1 ms – 1000 s |
| Frame buffer | Yes |
| Protective window | AR |
| Window diameter | 19 mm |
| Window thickness | 0.55 mm |
| Recommended filter diameter | 19–22 mm |
| Recommended filter thickness | about 1 mm |
| Camera length | 66 mm |
| Front diameter | 31.7 mm |
| Rear diameter | 36 mm |
| Front thread | 1″-32 UNF-2B |