QHYCCD QHY8L - Manual (Page 6)

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work, please reduce the power gradually if the cooler power is high, and turn off the
power of the camera.
12. Clean the surface of CCD
If dust particles impact your images, you can open the front of the camera to clean the
surface of the CCD. We suggest using the flat field calibration method to process the
images for small dust particles so as to avoid the need to open the front cover. To open
the front cover, proceed as follows:
• Screw the front cover of CCD counterclockwise.
• Clean the surface of CCD with a manual air pump. You can use lens paper or a
commercial available SLR camera cleaning kit to clean the dirt which cannot be
cleaned up by the manual air pump.
The correct cleaning method using lens paper:
• Wash your hands with soap.
• Take a piece of lens paper and fold it once or twice (Do not fold too many times
as the lens paper will get very sharp and the edges may scratch the CCD glass
surface).
• Blow on CCD and use lens paper to clean the CCD surface. Make sure to
maintain an appropriate pressure for CCD with your hand.
• Finish cleaning and reinstall the front cover of CCD. If there is high humidity in
your environment, it is necessary to dry the inside of the CCD sealed chamber.
13. Using the center and angle adjustment ring
• There is M42/0.75 thread on the QHY8L, which can connect with the telescope
directly. You can use the center and angle adjustment ring if you need adjust
the center or the angle of CCD. But you should know that if you use this ring,
the QHY8L offset (focal plane distance) will increase by about 3mm.
• Center adjustment—Loosen the three screws around the ring. The
adjustment ring will fit into the dovetail slot of the QHY8L. By adjusting the
position of the three screws, you can achieve about 1 mm center adjustment.
• Angle adjustment--Unscrew the three screws on the ring slightly. There is small
screw on the slide side of the ring that adjusts the size of the inclination angle.
If you rotate the QHY8L relative to the adjustment ring, you can obtain the
correct angle.
• After finishing the adjustment you should tighten the three screws on the ring.