If you are talking about stitching shots together to make a panoramic image, a focal length in the region of 50mm is better because there is less distortion. If you are using an SLR a 50mm prime lens is ideal. You just need to make sure there is a slight overlap from one frame to the next

 

If shooting digital make sure that the white balance is manually set or shoot RAW, so that there is no colour temperature shift between shots. Even more tricky is maintaining a constant or graduated exposure through all frames, if shooting RAW this is less of an issue as this can be compensated in the conversion stage. If shooting Jpeg, this can still be done with a photo editing program, but it’s a little more tricky.

 

Also it is best if you take the shots in portrait orientation with a tripod mounded camera, even better if you use a lens collar as you can rotate the camera on the lens axis.

 

The reason for shooting in portrait orientation is so that you have a greater area to crop top and bottom to get a good panoramic composition, shooting in landscape orientation can leave you with a limited area to crop from and you may cut off some detail that you wanted in.

They wouldn’t have made the cane if you weren’t meant to break the rules