Customer Rating: 



Summary: tiny tool has utility for many reasons
Comment: Beware the word "SYSTEM" in the product title. It is not a "system". It is a quick and effective means of removing many smudges and lint from viewfinders, mirrors, and some lenses. It is not a one stop shop tool to clean your expensive glass.
* the tiny tip is great for point and shoot viewfinder glass: it gets in the corners
* brush stays lint free
* i use it to clean the mirror of my DSLRs with great effect
* TIP: buy some cheap-o canned Air Duster (Memorex 3 8oz. can pack costs ~$15 and lasts for months with half a dozen cameras) and carefully blow off your glass and internals (hold camera upside down) do remove dust
* avoid any kind of wipes, microfiber cloths, chemicals (except "Invisible Glass Professional") for your optical glass investments. When using Invisible Glass always use a brand new (not washed and reused) microfibre chamois guaranteed to be lint and particle free. Don't do this often, and always make sure you blast off the glass with Air Duster to remove the hard particles first.
Otherwise this pen is a great little tool for small jobs. Just use common sense and don't ruin your glass.