Quote:
Originally Posted by MikeyB
a thin layer of microscopic cones all over the surface
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Reminds me of the surface of an anechoic acoustic chamber. It will look great when new, but won't last long as it's going to be almost impossible to clean:
a) any physical contact (wiping) will take the tops off the cones, permanently degrading the coating;
b) contaminants will end up stuck between the cones, especially sub-micron dust which will result in the surface looking 'grey' and impossible to clean.
Maybe ultrasonic cleaning will work, but I haven't seen an ultrasonic cleaning tank big enough for a refractor objective let alone a corrector plate !