Hi all!
I did some sensor analysis in SharpCap with my QHY294MM during the bad weather period to find the best gain settings in terms of noise. Long story short, Gain 1600 is really the sweet spot (I did it with Gain 10 steps around 1600).
But I found with the advice of my good friend @Markus Wirth , that under my relatively good sky (bortle 3-4) I should also aim for a better full well.To see how this changes, I decided to make an exposure series of a field of bright stars and nebulae and found the Pleiades perfect for such a test. There are both bright (saturated) stars and faint reflection nebulae there.
A comparison between my good old SVBony UV/IR cut filter and my new Optolong UV/IR cut filter was also part of the test, since that part on top is not too time consuming.
This test was performend in nautical darkness and without guiding using a SW 10" f4 Newtonian with a Nexus 0.75 FRCC (image Opto 750 just with one sub as the other was lost😐).
According to other reports about this chip, no banding occurred at the lower gains in my images.It is not my intesion to start a scientific analysis of the pixel values etc. here. Surely you can also evaluate this in more detail, or apply different types of analysis. This is just a quick and easy process paired with optical evaluation.
I will leave the interpretation to you and would be happy if you share your opinion here.
CS Mike
I did some sensor analysis in SharpCap with my QHY294MM during the bad weather period to find the best gain settings in terms of noise. Long story short, Gain 1600 is really the sweet spot (I did it with Gain 10 steps around 1600).
But I found with the advice of my good friend @Markus Wirth , that under my relatively good sky (bortle 3-4) I should also aim for a better full well.To see how this changes, I decided to make an exposure series of a field of bright stars and nebulae and found the Pleiades perfect for such a test. There are both bright (saturated) stars and faint reflection nebulae there.
A comparison between my good old SVBony UV/IR cut filter and my new Optolong UV/IR cut filter was also part of the test, since that part on top is not too time consuming.
This test was performend in nautical darkness and without guiding using a SW 10" f4 Newtonian with a Nexus 0.75 FRCC (image Opto 750 just with one sub as the other was lost😐).
According to other reports about this chip, no banding occurred at the lower gains in my images.It is not my intesion to start a scientific analysis of the pixel values etc. here. Surely you can also evaluate this in more detail, or apply different types of analysis. This is just a quick and easy process paired with optical evaluation.
I will leave the interpretation to you and would be happy if you share your opinion here.
CS Mike