Hi,
We know that on paper ABBE number describes amount of dispersion. But this is not inherited property of a real lens - in a real lens, in order to describe dispersion, we have to include another factor - thickness. The wider the angle of a prism => the more dispersion.

So I wonder how much the less thickness will reduce the negative effect of lower ABBE on a higher refractive index lens.
And before I start digging forgotten formulas, does anyone have some already calculated conclusion?