Quote:
Originally Posted by Bart
Thanks everyone, I appreciate the thoughts. I really like the qhy9, it has served me well. The bright streaks are becoming more obvious as the camera ages. It really ruins a good image. Allan has explained the fix well.
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Hi Bart,
the QHY9m has a KAF8300 sensor with a Hydrogen Alpha 656nm
quantum efficiency of about 48%.
see here:
https://www.baader-planetarium.com/e...ccd_camera.pdf
I'm finding it difficult to get a graph showing the quantum efficiencies
of all the latest CMOS chip cameras.
Can anyone find one?
You have to be careful with QE as sometimes the vertical axis on their graphs
refers to relative QE where they make the highest value 100%
usually on the peak of Green.
That can be very misleading and I think it's a sales trick.
The new CMOS cameras are supposed to be a lot better than that although many
of the CMOS sensor chips from just a few years ago are not much better at 656 nm - the Hydrogen Alpha wavelength.
It's nice to have 16 bits to play with on the QHY9m.
It could give an advantage when stretching the data.
I use NASA FITS liberator to do that.
Apart from the dark line problem - I really like the QHY9m.
I think I've solved it using the QHY9 instructions from the factory.