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Should I worry about nitrogen loss in my ED50?
In the early 1980s many birders in Britain used Optolyth drawtube scopes. These leaked like a sieve in the rain. As did the first Nikon Fieldscopes (Fieldscope 1). When they got wet inside people just unscrewed them and let them dry out. I remember sitting in Nancy's cafe in Cley on a rainy...