QHYCCD QHY90A, Руководство пользователя

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QHY90A
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08 FAQ
1. What's the back focus length of this QHY90A
?
The back focus length is 33mm. If it is used with QHYOAG-S and M42 adapter, the back focus length will
be extended to 46mm.
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 QHY16200A not QHY90A, but they have similar structure.
Follow the instruction carefully.
You need to prepare the tools by yourself to open the camera.
Remove all the screws on front of the camera case and remove the front case
You will see two screws to fix the filter wheel case (the middle layer of the camera). Unscrew them.