Field of View information required

[JTPhotographics]

Hi gang,

Yesterday I took position of a new motorised panoramic head. The head allows for the digital input of information to allow the head to calculate the frames etc required for the desired pano. One of the questions it asks is the FOV for both Horizontal and Vertical.

My go to lens for shooting Panos is a Sigma 50mm F1.4 EX DG HSM. When I look at the tech specs is says Angle of View 46.8 degrees. I believe this is measured across the diagonal and Im wondering if this can be translated to Horizontal and Vertical degrees?

Any help is greatly appreciated.

For information, this is on a Pentax K5 if that makes any difference.

Regards
John