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Message: <blockquote data-quote="Binastro" data-source="post: 3486169" data-attributes="member: 111403">Hi Ed,Thanks for that.A nice read of things that I had forgotten.It doesn't get into the question of what materials are used in multicoating lenses.Also how rays at an angle are dealt with.P.S.It also does not say how can one can judge with certainty, from visual observation, whether a surface is multicoated or not.Also does a moisture film or haze affect the appearance or colour seen visually on a single coated or multicoated surface?How do single coated and multicoated surfaces change in appearance when looked at at increasing angles?A wikipedia article confirms that a single coating on high index glass can reduce the light loss to less than 1%.</blockquote>