20" homebuilt truss dob 6" watson refractor
Quote:OK, I'll try.When in outer focus, perfect donut, diffactions rings look picture perfect. As I start going toward focus I start seeing spikes to one side. Then when going to inner focus, I no longer have a perfect donut. If I make adjustments to make the donut perfect, then when I go to focus I start seeing spiking and as I go to outer focus it's not a donut again. It's like I'm chasing my own tail.