8-inch F/6 Further Correction and Testing

Sharing further updates about the correction and testing of my 8 inch F/6.

In the below video, You can see the center is still slightly deep. There is a ridge around it that appeared during the correction and is now at the same level as the outer zone. I expect the next few correcting sessions will remove all the kinks and the surface will become more smooth and spherical.

Previous to the above testing, I also took a video to show the visualization of the thermal air current during the Foucault testing. It shows why you should keep the air temperature vary stable during the Foucault testing. I usually keep all the doors and windows shut during the testing.