ZWO ASI461MM Pro 100MP USB 3.0 Cooled Monochrome Astronomy Camera

Medium Format Cooled Camera
ASI461MM Pro adopts Sony medium format IMX461 sensor. It has the native 16-bit ADC with 65536 levels, back-illuminated structure and high quantum efficiency, and a great performance in DSO imaging, milky way imaging and scientific research. It features very low readout noise and nearly zero visible fixed-pattern noise.

100mega Pixels
ASI461MM Pro is a 100MP camera with a large sensor size of 44mm x 33mm and a high resolution of 11656 x 8750. The 3.76microm pixel accommodates an impressive full well capacity of 50.3ke. While at Bin2 mode, you can get an even larger full well capacity of 198ke and a larger pixel size of 7.5micromx7.5microm.

No Amp Glow
Traditional CMOS sensors produce a weak infrared light source during operation, which is quite often seen in the corner of uncalibrated images. This is the tell-tale signs of "amp glow". As the ASI461MM Pro uses zero amp glow circuitry, you won't have to worry about amp glow even when using high gain, long exposure imaging.

Anti-Dew
ASI461MM Pro comes with a polyimide heater that sits on top of the protective window. It will heat the window to avoid any dew problems. The power consumption of the heater is around 5W. You can turn this function off in your imaging software if you want to save power.

Camera Performance

HCG Mode
ASI461MM Pro has great performance and also a high dynamic range of up to 14stops. Set gain 100, then the HCG mode will be automatically turned on. The readout noise can be very low, while the dynamic range is basically unchanged. It is recommended to use Gain 0 or 100 for DSO imaging.

Quantum Efficiency
QE curve and readout noise are very important parameters to measure the camera's performance. Higher QE and lower readout noise are necessary to improve the image signal-to-noise ratio.

Two-Stage TEC Cooling
ASI461MM Pro features 2-stage TEC cooling. It can precisely control the temperature of the sensor, and lower it to 35 Degree C below ambient temperature. The dark current noises can be really low even for long-time expo-sures. When the sensor is cooled to 0 Degree C, the dark current noise is 0.003e/s/pix, which means a 300s exposure only generates 0.7e dark cur-rent noise in total - even lower than the camera's read noise! And if the cooling temperature reaches -20 Degree C, the dark current noise can even drop to the completely negligible 0.00024e/s/pix!

Note: External power supplies are needed for all ASI cooled cameras. We recommend you use a 12V@3A-5A DC adapter (D5.5x2.1mm, center pole positive) or a lithium battery with 11-14V to power the camera. You can also use ASIAIR to power the cameras. Be aware that using power supply out of this voltage range will probably lead to irreparable damage to the camera.