Hi Joe, I have had a lens pen for several years and have found it works pretty good. It is convenient to carry in the field. It does no damage. Others have borrowed it and used it and liked the product. If we meet up to bird one of these days you can try it. I bought mine at the Midweast Birding Symposim several years back from Eagle Optic. Did you get to Bombay Hook? Abbie/Bowie