Zeiss 15X60 B/GAT

Hello,
 I am lookind for information on this classic binocular, I like deep sky and wide angle observations, star clusters, objects like dark and bright nebulas are gem for me, anyone have used this binocular for this kind of celestial objects ?
Thank you
Paul

I've used these excellent binos that I borrowed from a friend they are exceptionally sharp but exhibit some field curvature and don't have a lot of eye relief.

Field is quite wide around 72 degrees.  I gave them back and then got a very good pair of overwork ultras which I would say are close in quality with better eye relief and a slightly flatter field overall.  Zeiss really have that oh boy these are good feel to them.  

Amazing in daylight superb contrast and image sharpness