ZWO ASI183GT 20.5MP Cooled Monochrome CMOS Telescope Astrophotography Camera with Integrated 5 Position Filter Wheel - ASI183GT

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The New ZWO ASI1600GT and ASI183GT CMOS Cameras Reviewed by Simon Lewis

The ASI GT USB 3.0 cameras include all the great features and performance of the original cameras but now include an integrated 5-position ultra-quiet electronic filter wheel as well as new features such as 12V power distribution. Of course ZWO retained features such as the integrated USB 2 hub so now you can reduce the number of adapters and cables in your imaging setup with the integrated design. This integration reduces complexity and saves space and money.

The ASI183GT and ASI1600GT monochrome CMOS cameras both offer the same outstanding performance of the ASI183 and ASI1600 cooled monochrome cameras.





Internal EFW

The internal 5-position Electronic Filter Wheel (EFW) can accept both 1.25" and 31 mm filters. The EFW is driven by a whisper-quiet high grade stepper motor.

Important Note: The thickness of the 1.25" filter cannot exceed 7 mm (without threads), and the thread must be shorter than 2.5 mm to avoid the filter wheel striking the camera housing.



The body of the EFW is CNC milled from an aircraft-grade aluminum block finished in an attractive and hard-wearing anodized finish. The inner surface of the EFW has been specially treated to prevent internal light reflections.



The camera body has 24 heat radiating grooves fitted with dual maglev fans to ensure the temperature difference before and after cooling remains between 40-45℃ below ambient temperature (Tested at 30℃). The lower the ambient temperature is, the lower the delta-T will be.

ZWO-ASI-GT-Camera-heat -radiating


Multiple Ports

12V power supply, USB 3.0 port & USB 2.0 Hub.  



DDR Memory Buffer

The GT cameras include a 256MB DDR3 memory buffer to help improve data transfer reliability.



The best solutions for a required 55 mm back focus:


Mechanical Diagram

ZWO-ASI-GT-camera-Mechanical- Diagram


ASI183MM Pro Details

Introducing the ASI183 camera series, the most sensitive cameras in ZWO history. Peak QE of the mono sensor reaches 84%!  This camera uses the IMX183CLK-J monochrome sensor

Diagonal 15.86 mm approx. 20.48MB  effective pixel IMX183CLK-J Monochrome/
IMX183CQJ Color CMOS image sensors, featuring high-speed and high-picture-quality rolling shutter-type back-illuminated CMOS image sensors

In the astronomic application field, Sony IMX183CLK-J (monochrome) and IMX183CQJ-J (color) sensors use a very high sensitivity back-illuminated structure with high resolution 2.4 um square unit pixel. The optical size is 1 inch.

The ASI183 Pro camera includes a 256MB DDR3 memory buffer to help improve data transfer reliability. Additionally, the use of a memory buffer minimizes amp-glow, which is caused by the slow transfer speeds when the camera is used with a USB 2.0 port

The DDR memory buffer is the main difference between ASI "Cool" and "Pro" cameras.

The ASI183 cameras has a very large full well capacity(15000e) for such small pixel size, 1.6e read noise @ 30DB, and 12stops dynamic range @ Gain=0. The ASI183 cameras also utilize firmware features to minimize amplifier glow for maximum performance in astrophotography.

ASI183 Pro has same mechanics as ASI1600 Pro. There are four screws that seal the sensor chamber. Our camera design has been extensively tested and is very stable. Even when used in higher humidity environments, ASI183 Pro will still work fine without dew problems.

Fast FPS can be used in solar(white light) and lunar imaging, as well as for live viewing/EAA. The high speed readout may also be used for real-time focusing, true lucky imaging of double stars and other small objects, planetary imaging of the major planets in the solar system, and much more.

The 10Bit ADC provides:
5496×3672 19fps
3840×2160 41.04fps
1920×1080 80.10fps
1280×720 117.30fps
12bit ADC 
5496×3672 19fps
3840×2160 36.12fps
1920×1080 70.48fps
1280×720 103.23fps

Sony's back-illuminated Exmor R technology, giving it excellent Deep Sky performance. ASI183 QE peak reaches a remarkable 84%. In Ha channel, QE is still over 60%.

Having high QE means more of the light that enters your telescope and reaches the sensor is actually used. With 84% peak Q.E. and no less than ~50% within the visible spectrum, the ASI183 will utilize a high percentage of the light that reaches it, improving your signal quality.

The dark current of the ASI183 is extremely low, based on our test results.

Dark frame sample @ Highest dynamic range settings(gain=0), 300s, -10°C, bin1. Please check the dark frame to make sure you are fully know the performance.

USB 3.0 Port & USB2.0 HUB
USB 3.0 Port: Provides 5Gb bandwidth to make it possible for ASI183 Pro to run at 19 fps (12bit, normal mode) or 19 fps (10bit, high speed mode) at full resolution(20.18MB).

USB 2.0 HUB: Can connect with various accessories, such as filter wheel, guide camera and electronic focuser, so you can better manage your cables. The ASI183 Pro includes two short 0.5m USB 2.0 cables. The integrated USB 2.0 hub is powered by the external power source if you connect one.

The ASI183 Pro has a 2-stage TEC cooling system that enables deep cooling (40°C-45°C below ambient). The cooler requires an external power supply, which is not included with the camera. You may order a suitable power supply.

Recommended cooler power supply: 12V @ 3-5A (or more) DC adapter (2.1×5.5mm, center pole positive). Also suitable: DC battery with 9-15V.

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