$$\mathrm{\text{ CF2}}:\frac{z_1}{z_0}=\frac{1}{2\left(x+1\right)+}\frac{{\nu }^2-{\left(\frac{3}{2}\right)}^2}{2\left(x+2\right)+}\frac{{\nu }^2-{\left(\frac{5}{2}\right)}^2}{2\left(x+3\right)+}\cdot \cdot \cdot$$