Less than a year ago my "office" purchased several Zeiss Diafun 8X30 binoculars; we also purchased several Steiner Military/Marine 10X50s.
I have not been impressed with the set of Zeiss' I was issued...they are too difficult to focus, and I attributed this to the fact they don't have the Steiner's individual eyepieces.
Last weekend, a piece of cheap plastic covering the objective ends of the Zeiss' came off......way too easily. I could be wrong, but this leads me to believe these things are not nitrogen purged nor sealed to withstand much abuse. On top of that, they began rattling.......one of the lenses inside (my terminology may be wrong, forgive me) is loose and moving. The binocs weren't dropped nor abused.
I called Zeiss; they had me ship them to their Virginia facility for repair or replacement. I did that today, 8/1. We'll see what they do and how fast they do it. We'll also see if this accounts for the difficulty in focusing.
I will say that I own a pair of Steiners we can't normally get here in the US (12 years now) and they have been the most awesome pair of glasses I've used to date. The other Zeiss' in the office appear dirty on the inside, none of the Steiners have had issues except with the rubber eyecups coming off.
I'll post back the results...they said 2-3 day turnaround, with replacement being the usual result.
RR