Raymond,
that piece of glass is looking
pretty. Nice smooth lines in the Ronchi gram. Appreciate
the video clip on rough parabolizing. Keep the reports coming. Watching with interest.
I have managed to finish polishing (for the second time), my 33". This time a good scratch and pit free finish. Also the 25"er polished out, (also nice clean finish). Figuring these being the next step. First will have to run some diagnostics (Ronchigrams) to determine strategies
for each optic.