I was encouraged to try this by this amazing image:
https://www.astrobin.com/368451/C/Using techniques usually reserved for planetary objects. He notes:
"Due to fact it is extremely bright and small I was able to use very short exposure times - from 100 to 250ms
I collected thousands of frames which allow me to rebuild depth and create nice, easy to stretch stack.
Scale of the picture is around 0,136''/pix !!"
So I was encouraged to try this with my new Stellarvue. Unfortunately I could not stack short exposures in the same manner as Lukasz. I could stack down to 1s exposures using video software, but there was just too much noise.
He notes further: "I see that you used STT 8300M camera which have 9,3e- readout noise.
My camera (ASI178) has only 1,2e- so its 7x less. It's huge gap and I consider it that this is main focus why you don't have good results. Simply, very weak signal is covered by readout noise, and this is impossible to pump it up during stacking process."
In understand form another friend, Rob, that the reason for this is that the read noise in most CCDs is too high because of the charge transfer design.
Thus, I have concluded that you cannot do this with my camera, but I post the image as a learning exercise and perhaps it will avoid others going down this route.
Comments