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Interesting that you ask about Strehl Ratio Houghy.
When I was looking around before I bought my scope I came across the term back then.
Bintel was one of the shops that mentioned it in relation to the GS 12". Even though I ended up getting mine from Andrews I was impressed at the GS Strehl rating.
It is reported, according to Bintel, that GS 12" optics train is between 9.4 and 9.6
That sent me off on a Google search for what 'Strehls' are! After reading up about the Strehl Ratio I am more than happy to know that GS mirrors are of a very high quality.
Congrats to the GS factory for pumping out mass-produced optics at such a high Strehl Ratio.
Some other brands were lucky to make 9.2 on the chart I was looking at. Apparently that level is not good.
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