QHY163
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20
5.
How is the anti-amplifier function in QHY163C?
If you found there is dust on the CMOS sensor. You can screw off the front part of the QHY163C. The
QHY163C's CMOS sensor has the AR coating so you need to be careful to clean it. You can use the clean
kit for DSLR sensor to do it.
The optic window is the IR cut coating or AR coating. So you need to be careful when cleaning it. You can
also use the DSLR clean tools or the lens paper. Don't use strong force to clean it. The coating is not so
hard and it is easy to get scratch when you use strong force on it.
6.
How is the anti-amplifier function in QHY163C?
QHY163C camera has the anti-amp light control circuit and it can reduce the amplifier glow significantly.
Note that it's impossible to reduce the glow in the corner thoroughly, and it's normal to see a very small
amount of glow in the corner when you do long exposure.
This is a demo picture for the QHY163C glow in 60sec exposure and high gain. Dark frame calibration can
remove it completely.
7.
What's on-camera DDR buffer and what is benefit for?
The QHY163C has the on-camera 128MB DDRII image buffer. It brings two advantages: It can buffer whole
image and avoid it lost during USB transfer. Because CMOS sensor outputs the image continuous after
exposure end and it does not allow the pause. But the computer may have some pause due to the multi-task
feature of the windows. If the pause is too long, the small buffer in the USB transfer chip will full and the
coming image data will lost. And it will cause one frame is lost some data and this frame will be a bad frame.
For short exposure it maybe not cause big problem because the next frame will comes soon. But for long
exposure it means you lost a long exposure frame. The 128MB DDRII buffer can solve this problem by storing
the whole frame into it and transfer. Even the computer has big pause it will not lost data.
Another advantage is that it will make the video more smooth when in some slow computer or some
mainboard which is not friendly to USB3.0(like the VIA chipset) . In these computers they cannot handle the
high speed USB data well and the data is always lost. With this DDR it can buffer the input image data and
then send to computer. Even the high frequency pause happens, it can keep the USB data lossless.
