I said widely copied as in nitrogen purging, duplex style reticles and side focus/parallax adjustments. Not a few very expensive, top quality scopes that hardly anyone buys.
Oh, and where are the tests that prove these coatings are tough ? E
Bushnell tested these coatings by cleaning them with a pencil eraser and they detected no measurable loss of coating thickness or water repellency.
The fact that Bushnell had patent rights on Rainguard might have had something to do with others trying to copy it.
I don't know if Diamond Coat is as durable as Rainguard HD. Besides, it doesn't repel water so it's irrelevant.
