The ZWO ASI120MM-S is an affordable and sensitive monochrome astronomy camera for imaging the planets, Moon, Sun (with a safe solar filter), and brighter deep-sky objects through a telescope. The camera incorporates a 1.2 megapixel CMOS sensor with a quantum efficiency (QE) as high as 75% to keep exposure time to a minimum. The pixels of the sensor are 3.75 microns in size, small enough for imaging solar-system objects but large enough to capture low-noise images of brighter nebulae, galaxies, and star clusters. The ASI120MM-S is the faster USB3.0 version of the ASI120MM camera from ZWO. At full resolution of 1280x960, the USB3.0 interface of this camera can transfer up to 60 frames per second. At reduced resolution, download rates up to 254 fps become possible. Such rates make it easier to produce high-quality images of solar system objects, especially quickly-rotating objects like Jupiter and Saturn. Many cameras in this price range have plastic housings, but the ASI120MM-S has a robust and attractive CNC machined red-anodized aluminum body that stands up to heavy field use. All software and drivers for this camera are available from the manufacturer’s website. This camera is compatible with Windows (32-bit and 64-bit) XP or later versions and Mac OS X. NOTE: This camera is best used with a refractor or reflector telescope mounted on a solid equatorial mount that can accurately track the motion of the sky. It is not intended for taking images through the eyepiece of a telescope. This camera produces monochrome images, but it can be used to produce color images with an astronomical LRGB color filter set and standard image processing techniques. You may also require additional accessories and filters to get the best results. All software and drivers for this camera are available from the manufacturer’s website.