At the 6.5mm setting the zoom has a 60 degree FOV (same as a Radian) and the sun's disk almost completely fills the view.
I compared Baader Orthos, Naglers and Ethos eyepieces to see which was best and was surprised hat none of the other eyepieces could beat the zoom. I suppose it's a case of the zoom's optical characteristics exactly matching the Lunt.
So you can see the whole disk in a 6.5mm eyepiece - wow. I imagined that that at the focal length for the scope the disc would be larger. Guess I got that wrong!