Quote Originally Posted by Keith Pitman View Post
I use Cat Crap on my ground glass and it works very well. It’s available from Amazon and elsewhere. I love recommending it too!

I wouldn’t put anything on my photo lenses. They shouldn’t fog up if you condition them first, i.e., don’t use them until they have been in the cold for a while. If you take them into the cold from a warm house or car, you have a good chance of having them fog up.
Isn;t that the opposite?