Found the following excerpt/link from the AR listserve.
Common sense, but we all get busy and can forget about such
"....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....."
WHEN is fall coming........geez, I give.
BTW, seeing a few reports of fall migrant passerines here and
there on the Midwest listserves.
St. Louis co.