Before taking the HDR image into Maya though, the photographs must first be converted into a HDR file using Photoshop and HDRShop. To do this I opened Photoshop and selected File > Automate > Merge to HDR Pro and selected the photos. Photoshop then automatically aligns the photographs in case the tripod was knocked when taking the images.
Once this is done, the image needs to be cropped down to a square containing the light probe and saved out as a HDR image. I then opened this file in HDRShop and selected Image > Panorama > Panoramic Transformations. The image must be converted from a Mirrored Ball to Latitude/Longitude, and then saved out again as a HDR file.
This stretches out the image onto a rectangle which is then opened up again back in Photoshop. The final step is to paint myself out of the image before saving it for a third time as a HDR, ready to be opened in Maya.