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Message: <blockquote data-quote="typo" data-source="post: 3496465" data-attributes="member: 83808">To my embarasment, I realise I've never asked Meopta what prism coatings are used on the Meostar and Meopro. The product manager has told me at some length about how many coating machines they have and which type, and other capabilities. That certainly includes dielectric coating, but I think you might be right that the Meostar probably has silver.Unlike most companies, Meopta quotes the photopic corrected integral of the transmission spectrum for their transmission figure, not a value at a specific wavelength. It means it's adjusted for the light sensitivity of the eye and should be a better indicator of 'brightness' and is the more correct scientific method. However it does make comparisons to other models difficult. Meopta have quoted 86% for the Meostar 10x42 HD and the 12x50 I recently reviewed at 89%. They actually sent me transmission plots as well which showed the 550nm value to be about 89.5, so in close agreement on this occasion. However for some of the other top models with a narrower transmission profile the integral could be significantly less. For what it's worth, I thought the Meostar 12x50 HD was a pretty bright binocular, but I'd agree, why, is much more complicated than a single transmission value.David</blockquote>