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Since this is an article about the Fried parameter, the definition of the parameter is of central importance in the article. However, the definition given is unclear, and it is given as a single sentence without illustration. I suppose a diagram would be helpful, but it definitely needs more explanation. [I am seeing, in a scientific article (astronomy), modelling of experimental results expected with different Fried parameters. Though I can see that the parameter is high when seeing is good, I am seeing Fried parameters of 1 cm to 10 cm, which appear to be ridiculously large apertures to allow an angular ray deviation averaging a radian, in a telescope. So, what is the Fried parameter, and how does one relate it to radian measure? 2001:5B0:2B3A:4310:6558:D2C1:24C6:387D ( talk) 00:19, 26 September 2015 (UTC)Roger Venable reply

The article says... Since professional telescopes have diameters ${\displaystyle D\gg r_{0}}$, they can only obtain an image resolution approaching their diffraction limits by employing adaptive optics.

Fried ^[1] himself came up with the idea of Lucky cams (aka webcams), where you take thousands of photos, and only use the few that have no turbulence. The rest are discarded. This way the telescope can perform at close to ${\displaystyle 1.22\lambda /D}$.

Tim (I really should get an account here) 220.253.26.95 ( talk) 10:46, 31 March 2019 (UTC) reply