Got collimation?

Oct30
by kevin on October 30, 2022 at 11:27 and modified on October 30, 2022. at 11:35
Posted In: astronomy

Over the last few months we do not seem to be getting the performance out of our 20cm Vixen telescope. Everything has been cleaned, the 90 degree diagonal has been removed, the x2 Antares barlow has been removed.
Planetary imaging remains soft, fuzzy and low resolution.
So after all of that one of the few possibilities left is that of collimated optics.
Here are some samples of going in and out of focus to see if the patterns are symmetrical or not.
These have been compressed down from the original 200-800MB files using handbrake, downgrading resolution to 480p.
The star is Altair, a magnitude 0.75 star approx 31 degrees above the horizon.
I hope to try again on a 2nd magnitude star, as recommended.