Quote:
Originally Posted by Terry B
I have tried this as I have my SA on a filter wheel. It will make it easy to position a star on a knife edge etc as I can frame it with a clear filter first. I tried subtracting a clear image but it didn't work probably becuse of different focus with the SA and the clear filter.
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Yes, I had to refocus and then readjust the frame size to get the stars to match. Also you can see I didn't place the camera back in exactly the same position after removing the SA.
It was a fiddly job.
How does the knife edge/SA distance affect the image?
Ah next investigation.
