Quote - Stewman said  "I love BB's environment sphere and I used it all the time, but it requires too small a camera focal length for some renders." He didn't say what problem he's solving with the smaller focal length. Most people are referring to pixellation when they complain of focal-length related problems with an environment sphere. They're usually not referring to perspective or ability to move around.

What is needed for high-res high-focal length images rendered inside a sphere is a high-res equirectangular image - something like 20K by 10K.

In this case, I am talking about perspective.  I don't particulary care for how the cars look with a lower focal-length of say between 15-25mm.  I can't think of what the term for it is, but you know - the "size" difference between closer and further away objects.