What can be done with misty optics?

[markH]

My knowlege of this is 40+ years old but when I worked at Parker Hale, the armourer had the necessary equipment to replace reticules refil with nitrogen and re-seal them. It was specialist gear in those days but whether things have changed I have no idea.

[Antoni]

Thanks for the info.

Err... it seems to be a good idea to clean the outside of the lenses with IPA and mocrofibre cloth now and then... scope sorted (!)

But the problem is still there with the binnos.