We have used a pair of 7X50 on a cruising sailboat for 12 years. The optics, day or night can't be beat! Only problem is the "armor" coating. The original went 3-4 years before going soft and sticky where hands normally held. We are carefull not to have bug dope or sun block on our hands. Sent them to Steiner, they said "no problem we'll replace the armor ----------for about $90" We had told them the whole story of our care of and satisfaction with, but no free fix. The armor is soft again and they wear a pair of "pants" made out of sox! So, we love the optics but are very dissapointed with the Company!