I agree with Morton
The Baader also has the widest FOV range for any zoom eyepiece. It's optical quality is also excellent and performs really well across all scope types, fast Newts & refractors as well as Maks and SCT, which is remarkable. I've had a couple of zoom EPs, and looked through many more, and the Baader is just about as good as it gets for zoom eyepieces. There may be others that perform just as well, and maybe even better, but I haven't seen one, and I'm sure others will reference these.
Jeremy, I also use this Baader zoom with my Daystar Quark. Just about the only application I have for a zoom eyepiece.
Alex.