Binocular Optical Failures

[PathFinder]

While preparing for a coues hunt, my NL 12x42 took a little fall from my Slik 622. This was about a 30" drop. I forgot to lock the Outdoorsman's adapter, and they fell out of the tripod. I tried to catch them with my foot, but they glanced off and hit the concrete. Not hard enough to be alarmed at first, but a pretty good little bump. After putting them to my eyes afterwards, it was immediately apparent that they were out of collimation. They ended up being usable enough for the hunt, but the cross-eyed feeling got pretty old.
This happened to me on a pair of Meopta 15x56 as well, though in that case there was no clear drop or cause for the loss of collimation. They were replaced under warranty, and never had an issue for several years after.
The goal with this thread and poll is to identify any trends by design, brand, or cause. This isn't to suggest drop testing of binoculars like rifle scopes, but to see if there are any patterns to learn from. For example, does a binocular with a small hinge and long barrels (like the NL) have a higher failure rate than an open bridge (like the EL). This thread should focus on optical failures that prevent the operation of the binocular as an observation device. Cosmetic and non-function related failures like strap mounts, covers, and eyecups should be excluded.
If you have a failure to add, please post the brand and model, failure type, cause, and resolution like below:

• Brand and model: Swarovski NL 12x42
• Failure Type: Loss of Collimation
• Cause: Dropped
• Resolution: Not sent in yet

• Brand and model: Meopta/Euro HD 15x56
• Failure Type: Loss of Collimation
• Cause: Not known, maybe riding on ATV
• Resolution: Replaced under warranty

 

[IdahoBeav]

Maybe this isn't the data you want, but my buddy had a pair of SLC 15x hit the ground from about 6'. We were in a turnout glassing from tripods and standing. He went to the pickup to grab more gear. The wind blew his tripod over and the binos hit the gravel ground hard. He was using the swaro stud mount. The stud broke off and the binos did not lose columniation.

 

[PathFinder]

Maybe this isn't the data you want, but my buddy had a pair of SLC 15x hit the ground from about 6'. We were in a turnout glassing from tripods and standing. He went to the pickup to grab more gear. The wind blew his tripod over and the binos hit the gravel ground hard. He was using the swaro stud mount. The stud broke off and the binos did not lose columniation.

That's a valuable piece of information. Hard hits that didn't cause a failure are useful too!

 

[Turkeygetpwnd38]

My 12x42 NLs have fallen off a standing height tripod twice. Both times I felt like I was going to puke but miraculously neither time did they land on the lenses and no damage internally, just cosmetic. Both were onto hard packed ground with gravel.