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I have no idea Colin, but to my knowledge my new telescope is diffraction limited within the visible spectrum. Refracting telescope at f/6 will certainly have lower than 0.990 Strehl ratio for blue and red light.
On the report I also got multiple Zernike coefficients and all are near zero. For example Z8 is 0.01 and as I understand this coefficient is a measure of spherical aberration. Several other coefficients are in the order of ten thousandths (4 places after decimal place).
I guess we will need to wait for my first image taken with my new babe :-)
As a side note, if my memory serves me well, I remember reading on CloudyNights that CFF makes also planetary series with longer focal lengths, and their f/10 105mm telescope had/has Strehl ratio equal or greater than 0.995 from red to blue. Now, peeking through such telescope on a clear night would be a very special treat :-)
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