Astronomy Specialist



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The QHY 5L-II-M is the ideal camera for autoguiding and planetary imaging. It is extremely compact as it measures 1.25" in diameter so it can fit in standard off axis guiders and guide scopes. The 1.2 Megapixel CMOS sensor has an exceptionally high quantum efficiency at 74% and medium sized 3.75 micron pixels for a high signal to noise ratio. It is equipped with a USB 2.0 port that allows a download speed of up to 30 fps at full resolution (1280x960).

QHY 5L-II-M quantum efficiecy

The read noise is remarkably low at 4 electrons. The on-chip FPN calibration circuit drastically reduces the Fixed Pattern Noise. This technology allows to resolve one of the biggest problems of the CMOS technology, eliminating the banding pattern (Fixed Pattern Noise) caused by a different response of the pixel columns. 


Sensor CMOS Aptina MT9M034 - MONOCHROME
1.2 Megapixels 1280 x 960
Pixel size 3.75 µm
Sensor size 3.74 x 3.75 mm [diagonal 5.92 mm]
Quantum efficiency peak 74 %
Exposure range 20 µs - 600 s
Read noise 4 e-
Bit depth 12 bit
Speed 30 fps at full resolution / 106 fps at 640 x 480
Compatibility Windows, Mac, Linux
Optical window AR coated
Ports USB 2.0 (type B); ST4
Back focus 11.30 mm (17.30 mm with CS mount)
Connections 1.25" / M28.5 x 0.6
Dimensions Ø 31.6 mm ; ↨ 54 mm
Weight 51 g


QHY 5L-II-M technical specifications


  • QHY 5L-II-M
  • Metal box
  • 20mm extender with a 1.25" external diameter and female thread M28 x 0.6 for filters
  • USB 3.0 cable (1.8 meter)
  • ST4 cable (1.5 meter)
  • Focus locking ring
  • Plastic shims to adjust the CS lens distance (lens not included)
  • Camera dust cap


Guide to installing QHY and ASCOM drivers for QHYCCD cameras.


ZWO camera software QHY camera drivers

PDF Icon Small QHY 5L-II manual


Customer Reviews

Based on 1 review
Quincy Lee
Works great

Tested the camera in Sharpcap and it works great (paired with QHY medium off-axis guider attached to medium QHYCFW3 filter wheel). Was able to get it working properly in PHD2 as well. One thing to note, the driver that its supposed to be included with in the QHY268M driver package from the QHY website will not work. You’ll have to get the specific driver for this camera from

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