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"The aluminium coating placed onto the surface of the glass returns about 90% reflectivity.
The overall reflectivity combined with the secondary mirror drops down to about 80%.
Different enhanced coatings brought out by manufacturers can bring this figure back up to
around 90%."
and....
"The following aluminsisng prices include enhanced overcoating for maximum reflectivity."
So yes, they do... the second 90% they quote is total system reflectivity(including secondary), or, 90%^0.5 = 94.89%, so approx 95% per enhanced coated reflective surface.
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