The BHZ has been measured at 44 AFOV, and reportedly 22.5mm actual focal length at the 24mm setting. A 10 Ethos has the same TFOV, so the BHZ goes about as wide as a 20mm Plossl. Not really advisable to use as a low power finder eyepiece, unless you have a very short FL scope (or accurate GoTo).I’ve been using the Baader Mk. IV zoom for a few weeks now. Really enjoying it! It does get a little ‘thin’ on FOV when you hit 24mm focal length on it, but still having it at a 48 degree FOV is very good for a zoom at that focal length. Some hobbyists and YouTubers state it’s more 50 degrees than 48 degrees, but the jury is still out on that claim. Most are 38-40 degree FOV. Using a zoom EP that can go from a 48(50?) degree FOV at 24mm, to a 68 degree FOV at 8mm, I consider pretty exceptional in the world of zoom eyepieces.
On another note, I just received the Pentax XF 6.5mm - 19.5mm zoom in the post today. I wanted to compare views between the Baader Mk. IV and the Pentax XF zoom. The Pentax has the Lanthanum glass and the Baader has their ‘Phantom coatings’ for clarity, brightness and resolution. The Pentax is more of a planetary and lunar zoom as its highest magnification is 6.5mm, whereas the Baader Mk. IV is at 8mm. Looking forward to the next clear night to compare the views through both zooms and see how they stack up against one another for high power viewing.
Granted, it is still wider than the standard 40-60 zooms, which often aren’t actually 40-60. But in general it is only roughly 10% wider throughout the range, so mostly you are paying for superior correction and optical performance.