The 6.7 had a somewhat yellowish color as I recall - not your usual glass. It is the one lens I've had stolen, so can't look at it now. I replaced it with a 240A, which is more convenient for backpacking and even sharper. But the 6.7 produced wonderful pictures, both color and b&w, conspicuously crisper and better textured from what my Symmar S did, which was no slouch itself.