Condolences to Preston's family and friends.
His callibaetis pattern is deadly. Anytime. Not "just" during a callibaetis hatch.One time I was camped at Chopaka and was tying flies and struck up a conversation with the white-haired gentleman camped next door. He was telling me of his success with a callibaetis emerger, a bamboo rod and a Sylk line. After just a few sentences, having never seen or heard the man before, I asked him if he was named Preston. I just had a feeling from his published articles and writings on here. He seemed a little surprised and admitted that he was indeed. He shared one or two of his Chopaka emergers with us. They do work. He tied very nice flies among other things. RIP Preston.