For a lens projecting a rectilinear image, the angle, or field of view (\alpha) can be calculated from the chosen dimension (d, the width of a 35mm image), and effective focal length (f, 35mm in Vue) as follows:
\alpha_h = 2\arctan\frac{d}{2f} = 2\arctan\frac{36}{2 \times 35}\approx 54^\circ