I am a bit confused on how to figure the best size eliptical secondary for my Edmund White 6" f8 scope. I have heard 15% to 20% obstruction but not sure how you figure that with an eliptical vs. a round primary.
What quality should I be looking for?? Will a 1/10th wave be OK or are substantially better results had with higher quality.
Thanks
Bruce
What quality should I be looking for?? Will a 1/10th wave be OK or are substantially better results had with higher quality.
Thanks
Bruce