Super ED and ED glass is different than lens coating. The Extra low Dispersion glass is actually the material used to make the lens. This glass is then multi-coated in the same way non-ED glass is treated.
Coatings have no effect on chromatic aberration (CA), they are used to reduce the reflection of the light at the glass/air boundary.
That said, ED and Super ED glass provide for increased contrast and make for better overall IQ, exactly as you said.
Coatings have no effect on chromatic aberration (CA), they are used to reduce the reflection of the light at the glass/air boundary.
That said, ED and Super ED glass provide for increased contrast and make for better overall IQ, exactly as you said.
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