nicoscy

The zoom is actually 70 degrees to 42 degrees according to Edz on Cloudynights and I concur after using it side by side with a Celestron zoom. http://www.cloudynights.com/topic/287534-hyperion-zoom-mark-iii-tested-afov/ As I mentioned, I actually ordered (again) the Celestron Zoom as I preferred less weight and I was willing to sacrifice a little optical performance for the weight / size saving.

The Baader has a larger field of view than the Celestron and better coatings (I have tried both). You can also take advantage of many accessories for the Baader and connect it in various ways to your equipment. However it is both heavier and bulkier than the Celestron Zoom. If you intend for serious use of this eyepiece as opposed to using fixed focal length eyepieces and just "having a zoom", then get the Baader, otherwise the Celestron will serve you well.

Most basic zoom eyepieces are threaded under the eye cup for this specific reason. Enjoy the zoom. Even though I am overflowing with eyepieces, I actually ordered one myself as it is great for outreach and for when I want to just grab the scope with one eyepiece and head out of my home for a quickie...

Zeiss ED Terra 8x42 Nikon Action Extreme 10x50 Canon 10x30 IS on the way