G3M C+1.25” Mount USB3.0 CMOS Guiding Astronomy Camera

G3M C+1.25” Mount USB3.0 CMOS Guiding Astronomy Camera is a series of high-performance guiding cameras designed for astrophotography applications. The series uses Sony IMX series CMOS sensors with a standard 1.25 inch outer interface for telescope eyepiece mounting and a C-mount inner interface for industrial lenses. It features USB3.0 data transfer, built-in ST4 auto guider port, and native/ASCOM/WDM drivers for integration with third-party astrophotography software.

Sony IMX series CMOS sensors deliver high sensitivity and low dark signal for precise guiding in astrophotography
Standard 1.25 inch outer interface and C-mount inner interface allow direct fit to telescopes and industrial lenses
Built-in ST4 auto guider port enables direct connection to autoguiding systems without additional adapters
USB3.0 interface ensures fast data transfer and compatibility with modern imaging software
Supports native, ASCOM, and WDM drivers for seamless integration with third-party astrophotography platforms

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Technical features

Sony IMX series CMOS sensor with 1.25 inch outer interface and C-mount inner interface
Built-in ST4 auto guider port for direct connection to guiding systems
USB3.0 data transfer interface with support for native, ASCOM, and WDM drivers
Spectral range 380–650nm (with IR-cut filter), 350–1050nm (with double-side AR coating)
Operating temperature range: -10°C to 50°C
Cooling system: natural with high-performance cooling structure
White balance: manual temperature and tint adjustment (available for color sensors)
ROI and white balance settings supported for flexible image capture

Who it is for

Amateur and professional astrophotographers building or upgrading imaging rigs
Importers sourcing guiding cameras for astronomy equipment catalogs
Distributors offering precision components for telescope automation systems

Specifications

Models	G3M178C / G3M178M / G3M290C / G3M290M / G3M224C / G3M385C / G3M287C / G3M287M
Sensor	IMX178 (C/M), IMX290 (C), IMX224 (C), IMX385 (C), IMX287 (C/M)
Sensor Size	1/1.8" (7.37×4.91 mm), 1/2.8" (5.60×3.10 mm), 1/3" (4.80×3.60 mm), 1/2" (7.20×4.05 mm), 1/2.9" (4.97×3.73 mm)
Pixel Size	2.4×2.4 μm, 2.9×2.9 μm, 3.75×3.75 μm, 6.9×6.9 μm
Resolution	6.3M (3040×2048), 2.0M (1920×1080), 1.2M (1280×960), 0.4M (720×540)
Frame Rate	59 fps @ 3040×2048, 58 fps @ 1520×1024, 126 fps @ 1920×1080, 150 fps @ 1280×960, 240 fps @ 640×480, 520 fps @ 720×540
Sensitivity	425 mv (G3M178C), 776 mv (G3M178M), 1300 mv (G3M290C), 2449 mv (G3M290M), 2350 mv (G3M224C), 2350 mv (G3M385C), 4584 mv (G3M287C), 7469 mv (G3M287M)
Dark Signal	0.15 mv with 1/30s exposure
Exposure Time	0.244 ms to 1000 s
Binning	1×1, 2×2
Interface	1.25 inch outer (telescope eyepiece), C-mount inner (industrial lens)
Data Transfer	USB3.0
Guiding Port	ST4-port
Operating Temperature	-10°C to 50°C

Use guide

Select model based on required sensitivity, resolution, and frame rate for your guiding application
Use C-mount (C) variant for industrial lenses; M-mount (M) for specific telescope systems
Enable binning (2×2) to increase frame rate if real-time tracking is critical
Connect via ST4 port to autoguiding system; use USB3.0 for data transfer to computer
Configure software using ASCOM or WDM drivers for compatibility with imaging platforms

FAQ

What is the interface type for telescope mounting?

Standard 1.25 inch outer interface for direct fit into telescope eyepiece holders.

Can I use this camera with industrial lenses?

Yes. The C-mount inner interface allows direct attachment to standard industrial lenses.

Does it support autoguiding?

Yes. The built-in ST4 port enables direct connection to autoguiding systems without additional hardware.

What is the maximum frame rate?

Up to 520 fps at 720×540 resolution (G3M287C/M), 240 fps at 640×480 (G3M224C), and 126 fps at 1920×1080 (G3M290C/M).

What software is compatible?

Native, ASCOM, and WDM drivers support integration with third-party astrophotography software.