I have a Bausch & Lomb Trophy Riflescope Balvar Years ago it fogged up while hunting on a cold wet day. I sent the scope in for repairs and got it back, put it back on the rifle and about the third time I hunted with it, it fogged up again. Its been in a box for a few years and I would like to use it again if it can be fix.
Most things can be fixed again however at what cost???
the scope should be striped down and cleaned new "O" rings fitted to keep out the damp and then re-gased,,,,pricy job?
you could undo the small screw on the scope body and try warming the scope up to force out the damp air inside it then get some "NITROGEN gas" not co2! and blow that into the screw hole to push out any damp air left in it out and to re-gas the scope,,,,it may work it may not,,,,the nitrogen gas can be found at a camera shop check on the gas first but i think its called "dust away or dust off!" for blowing out camera bodys
dont start a gale inside your scope just jentely blow in the gas Read More At : Bausch & Lomb Hunting Elite 4200 Riflescopes Matte Finish......