I used a 24mm on a full frame for this. The narrower the lens, the more shots you would have to take. The one I posted was 12 photos, 30 degree intervals, in a vertical camera position. If I do another one, I will probably take 2 photos per angle instead of 1, to get better detail in the ground. I couldn't get the little planet profile because of this in PTGui. Had to stitch them together in PTGui and then apply the polar coordinate filter in Photoshop instead. If I had even coverage bellow and above the horizon, I am sure I could have done the whole process in PTGui.