Hermann
Well-known member
Not sure there, John. I found rather clear differences in colour rendition when comparing e.g. two Nikons (non-ED 60mm vs. ED), two Leicas (Televid vs. Apo-Televid) and few Kowas (TSN2 vs. a TSN4, 611 vs. 613).All else being equal there is no perceptible difference in surface colour rendition between ED and non-ED glass.
The non-ED scopes always looked "flatter", in any kind of light, with less saturated colours. They also looked somewhat softer in direct comparison, even at lowish magnifications.
Hermann