Hayward: What is happening to your binocs is simply atmospherics. When
outside temps are hot, the air can hold a lot more moisture than it can
when cooler. Thus there is a lot of water vapor in the air, ie. high
humidity. When your binocs are kept in AC, the surface temp of the glass is
much cooler than the outside temps. When that moisture laden air touches
your cool glass, the water vapor immediately condenses out as liquid water
that fogs up your lens. This problem should go away when the temp of the
glass comes up to equal the outside temp. This is the same thing that
happens when a glass of ice water "sweats" on the outside of the glass as
moisture condenses on the cool surface. The only option for your binocs is
to wipe off the condensation with a soft cloth until the glass warms up.

I remember one time we were in Central American birding. We had a cabin
with AC at our lodge. If we kept our binocs in the cabin at night, when we
went outside in the morning we couldn't see at all in the first 10 minutes
or so. It was so humid. Fortunately, the attached bathroom was not air
conditioned and we soon realized that we needed to keep our binocs there at
night so they would remain at the outside temps. That solved the morning
fogging problem.

Best wishes. Randy Rowe, Wooster

On Thu, Jul 28, 2016 at 5:57 AM, Steve Jones <[log in to unmask]> wrote:

> Zeiss has a Fog spray and wipe system that is good for binocs.  Googlé
> "Zeiss Fog Defender".  Should work on spotting scopes and cameras as well.
>
> Happy birding,
>
> Steve J.
>
> On Jul 27, 2016 11:39 AM, "Hayward Chappell" <[log in to unmask]>
> wrote:
>
> > OK- probably dumb question, but I think I need clarification:
> >
> > I always thought "fog free" binoculars meant that the OUTSIDE of the
> lenses
> > would not fog... so I bought Nikon Monarchs 7 which, like many other
> decent
> > binocs state that they are fog free. However, when I take my binoculars
> out
> > of my air conditioned house into this heat- they immediately fog up...
> so I
> > thought that my binocular seals had been damaged and I need to send in
> for
> > repair....
> >
> > BUT I have been reading sites that state that "fog free" DOES NOT refer
> to
> > outside of lens fogging up- is that true?
> >
> > If so- does everybody have this problem with outside of lens fogging up
> no
> > matter how fancy binocs are and is there any way to fix it?
> >
> > Seems like hear a bird I want to see- run inside and get my binoculars
> and
> > then run outside only to have them fog up and by time they clear- bird is
> > gone.
> >
> > Woe is me
> >
> > Hayward Chappell
> > Lawrence County
> >
> > --
> > Hayward Chappell
> > 766 Private Rd. 3952
> > Willow Wood, OH 45696
> >
> > ______________________________________________________________________
> >
> > Ohio-birds mailing list, a service of the Ohio Ornithological Society.
> > Please consider joining our Society, at
> > www.ohiobirds.org/site/membership.php.
> > Our thanks to Miami University for hosting this mailing list.
> >
> >
> > You can join or leave the list, or change your options, at:
> > listserv.miamioh.edu/scripts/wa.exe?LIST=OHIO-BIRDS
> > Send questions or comments about the list to: [log in to unmask]
> >
>
> ______________________________________________________________________
>
> Ohio-birds mailing list, a service of the Ohio Ornithological Society.
> Please consider joining our Society, at
> www.ohiobirds.org/site/membership.php.
> Our thanks to Miami University for hosting this mailing list.
>
>
> You can join or leave the list, or change your options, at:
> listserv.miamioh.edu/scripts/wa.exe?LIST=OHIO-BIRDS
> Send questions or comments about the list to: [log in to unmask]
>

______________________________________________________________________

Ohio-birds mailing list, a service of the Ohio Ornithological Society.
Please consider joining our Society, at www.ohiobirds.org/site/membership.php.
Our thanks to Miami University for hosting this mailing list.


You can join or leave the list, or change your options, at:
listserv.miamioh.edu/scripts/wa.exe?LIST=OHIO-BIRDS
Send questions or comments about the list to: [log in to unmask]