This is one nifty little lens cleaner I tell you! I've used it a couple of times on my camera lens till now and it does wonders cleaning finger print smudges. I just used the fine retractable brush first to get rid of any dust particles on the lens and then used the carbon smeared-head on the other side of the pen and moved the head in circular motions on the lens and within a few seconds the smudges were all cleared. It really does it's job well. The only downside is, although the brush is retractable I wish there was a cover (like on the opposite end of the pen which hosts the carbon smeared-head). The lack of the cover makes the frontal portion of the brush a bit vulnerable to dust catch. I keep mine in a small bag of sorts so it's all neat and good to go. I would recommend this lens cleaner mate.