If your binoculars are waterproof/fog proof, excessive banging and or dropping can cause the nitrogen inside the barrels to escape voiding their waterproof/fog proof status.
All binoculars come with a 'safety' or 'neck strap' attached to the binoculars that is normally adjustable in length. When viewing, always put the safety strap over your head to prevent accidental dropping of your binoculars. Insure that if others use your binoculars, they too install the safety strap over their head.
Armor' or 'rubber' coated binoculars are great at absorbing most of the shock generated by low impact banging. This rubber coating does not necessarily help if your binoculars are dropped or banged excessively.Even though your binoculars may be waterproof and or fog proof, keep them dry when possible. Wipe any water off with a soft cloth or towel before storing.
Do not store your binoculars in an excessively hot or cold vehicle. The excessive heat can cause swelling of the barrels which in turn can cause one or both of the objective (large lens) lenses to pop out or crack. Excessive heat and cold can also cause moisture or condensation to build up inside the binoculars. Don't leave your binoculars on the dash of a vehicle even if they are in the case. The sun shining through the windshield can magnify the outside temperature many times.
Company Resource: Straight Binoculars, Monocular Telescope
Read more: http://www.nbbinoculars.com/blog/
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