[Video, 9m27s, no audio] 7th figuring session on an hyperbolic 8" f/3.54 mirror

I filmed the seventh figuring session on the 8” hyperbolic mirror.

Here is a ronchigram, outside ROC, before working :

We can easily see the central hole and edge turn-up.

After this session, here was the result : global correction has advanced, and the central hole, still visible, has reduced. The edge turn-up has also reduced a little.