Compared to the previous DCF ED series we didn't notice any serious changes apart from the coatings; the transmission graph, shown below, is the proof that it can make a difference.
good transmission; excellent whiteness rendering; proper correction of chromatic aberration; negligible astigmatism; moderate coma; sharp image in the majority of the field of view; slight brightness loss on the edge of the field; relatively small; shapely and solid casing for a 43 mm objective...
not impressing field of view