QHYCCD QHY09000A, Manual

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QHY16803A
7 FAQ
1. What's the back focus length of QHY16803A
？
The back focus length of QHY16803A is between 44mm to 45mm, and if it is used with QHYOAG-
M and M54 adapter, the back focus length will be between 57.5mm 58.5mm. For more
information, please see the tenth part of this manual.
2. How to clean the CCD sensor and the optic windows of the camera?
Usually you can use flat fielding calibration to eliminate the shadow resulted from dust. It's not
recommended to open the CCD chamber to clean the CCD on your own. Because if you do it in a
place where there are still lots of dust, your effort may backfire. Besides, during the process of
cleaning, you may scratch the CCD, and you may damage the internal circuit when you open the
camera.
QHYCCD provides CCD clean service. The cleaning fee is 100 USD per time and it doesn't include
the shipping cost.
If you really want to clean it on your own, you can follow the instructions below.
Note that the camera used in instructions are not QHY16803A, but they have similar structure.
Follow the instruction carefully.
You need to prepare the tools by yourself to open the camera.