Binos Fog Up

[postoak]

My binoculars are almost worthless to me because they begin to fog up as soon as I try to use them. Is there some trick to prevent this?

[Sabre]

In cold weather they'll fog up from the heat from your eyeballs or your breath very easily. Learning to hold them farther away from your eyes and making sure not to breathe on them is the only cure. They're a big PITA for sure.

[swamp]

internal fogging is a different issue than external fogging....

external fogging occurs when warm moist air condenses on a cold surface...

[postoak]

I'm talking about external fogging. The moisture from my skin, I guess, condenses out on the cold lenses.

[swamp]

don't breathe on the lenses... if the air is dry the moisture will soon evaporate from the lense... there are some external applications that are supposed to help reduce external fogging but i've never used them

[Bayrat]

Some of the antique cars owners I know who's cars pre-date defrosters use Rainx anti-fog on the insides of the windows.

Think I'll try it on my binos.

Surgeons also have something they use on their glasses (using face masks often cause glasses to fog). I think it's some kind of soap that they use on the lenses ?????

Bayrat

[Bayrat]

Well, I couldn't find my little bottle of RainX anti-fog so I tried regular RainX. Didn't work for preventing fog up. Oh well.

Bayrat

[Bayrat]

Cleaned the shed and found the bottle of Rainx anit-fog. Tried it on my bino's and while it wasn't very cold yesterday, in the mid 30's F. , it works.

However, it has a very strong, highly flamable solvent in it and it may not be the best thing to use around plastics and coated lenses.

Bayrat

[Rock Chuck]

I would contact the bino maker before using it. You could trash the lenses.
I have the same fogging problem in some weather. I try to 'breathe downward' when using them by sticking my upper lip out so my breath goes down instead of out. It helps some.

[Bushman]

Back in my scuba diving days we used a solution inside our masks that prevented fogging so that stuff would be available at a dive shop should help. Lots of guys just spit inside their masks and rubbed it around. If that worked it would be cheaper than something from a bottle.

[postoak]

I had some success this weekend with tilting my head down and resting just the top side of the lenses against my eyebrows. This allowed some air in between my face and the lenses.