ZWO ASI174MM Monochrome CMOS Camera

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    ZWO’s new ASI174MM camera uses Sony’s latest Pregius IMX174 CMOS sensor. It combines several features putting it high on the list for anyone wanting to capture spectacular lunar and solar images, high resolution planetary images at long focal lengths or even as an autoguider without worrying “will I be able to find a guide star?”


    The main advantages of the Sony IMX174 chip are:

    • Large sensor size of more than 13mm across the diagonal
    • High quantum efficiency of 78% at its peak
    • Very low read noise of only 6e
    • Extremely fast frame rate – effectively freezing moments of steady seeing
    • Global shutter and no fixed pattern noise


    Sony IMX174 Sensor – big benefits

    Prior to the release of the ZWO ASI174 cameras it was difficult to find a good camera capable of full disk images of the Moon or Sun. This is no problem with the ASI174. It’s sensor has a pixel array of 1936 x 1216 with 5.86 µm square pixels. This makes the diagonal measurement of the chip 13.4mm across.


    The Image above shows the comparative field of view between the ASI120 camera and the new ASI174. Shot through a small refractor at 600mm focal length you can see the ASI174 will easily cover 0.5° of sky. It is now very easy to caputre full disk images of the Sun through many popular solar telescopes from Coronado and Lunt – no more mosaics required.


    Back Focus

    After remove T2 11mm ring, back focus length will be only 6.5mm.




    Quantum Efficiency and Read Noise

    Another big benefit of Sony’s IMX174 chip is the high quantum efficiency coupled with very low read noise. This equates directly to better signal to noise. Even with very fast capture rates you will get more signal from your target and less contribution from reading off the sensor of the camera – in essence cleaner data resulting in better images!

    For a few years now Sony’s highly regarded ICX618 CCD chip was a popular choice for planetary cameras. If we compare the new Sony IMX174 sensor to Sony’s ICX618 the news is good for both QE and read noise.

    The quantum efficiency of the IMX174 is slightly more than 11% better with read noise of nearly half! (6e for the IMX174 vs 11e for the ICX618).

    1/1.2″ CMOS IMX174 (mono)
    Pixel Array 1936 x 1216
    Pixel Size 5.86µm
    Exposure Range
    Bit Depth 12 or 10 bit output (12bit ADC)
    ROI Supported
    Interface USB3.0
    Adapter 2″ / 1.25″ / M42X0.75
    Peak QE
    Read Noise
    Well Depth
    Max Frame Rate
    164fps (at full resolution – 10bit)



    Mechanical Drawing ZWO ASI174MM

    ZWO ASI174 Mechanical drawing


    How to achieve a 55m back focus with an astronomy camera and a telescope with either a M42 or M48 thread


    About ZWO Optical

    Astrophotography has never been easier.

    Established in 2011, ZWO Optical is a fast-growing global astroimaging camera powerhouse based in Suzhou China. They focus on building and innovating ground-breaking CMOS cameras such as the iconic ZWO ASI120MM Monochrome CMOS camera (the first-ever planetary CMOS camera to beat a CCD in the early 2010s). ZWO continues to pioneer new astrophotography technology with revolutionary features to capture exceptional quality of images of space that will last you a lifetime. Today, ZWO cameras are recognised by every passionate astrophotographer and are available in over 25 countries internationally.

    Product Code: ZWO-ASI174MM

    More Information
    Sensor TypeIMX174
    Sensor Size1/1.2″
    Pixel Size5.86µm
    Resolution2.3MP (1936×1216)
    Colour / MonochromeMonochrome
    FPS164 fps
    Back Focus17.5mm
    Operating System CompatibilityWindows, Mac OSX, Linux
    UsageGuiding, Planetary Imaging
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